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Question 281Question →

The conservation strategies for the endangered leatherback sea turtle are more complex than a typical freshwater turtle, they require international cooperation to protect nesting beaches.

Which of the following choices best corrects the underlined portion in the sentence?

Show answer & explanation

Answer: those of a typical freshwater turtle; they

Answer

The choice that states 'those of a typical freshwater turtle; they' is correct because it ensures a logical comparison by comparing 'conservation strategies' to 'those of' (the strategies of) a freshwater turtle, and it correctly uses a semicolon to separate two independent clauses.
The correct option is 'those of a typical freshwater turtle; they' because it resolves the illogical comparison by comparing 'conservation strategies' (plural) to 'those of' (plural pronoun referencing the strategies of) a freshwater turtle. It also correctly uses a semicolon to separate the two independent clauses.

Step-by-Step Solution

1
Identify the items being compared in the sentence.
The sentence compares the 'conservation strategies' (a plural noun phrase describing actions/plans) of the leatherback sea turtle to 'a typical freshwater turtle' (an animal).
To be grammatically and logically correct, comparisons must compare similar things (noun-to-noun or concept-to-concept).
2
Correct the illogical comparison using a plural pronoun.
Since 'conservation strategies' is plural, the pronoun 'those of' must be used to represent 'the conservation strategies of'.
This ensures that strategies are compared to other strategies, not to an animal.
3
Analyze the punctuation joining the two clauses.
The sentence contains two independent clauses: the first ends with the comparison, and the second begins with 'they require...'. A semicolon must be used instead of a comma to avoid a comma splice.
A comma alone cannot join two independent clauses without a coordinating conjunction.

Key Concept

Illogical Comparisons and Comma Splices
Question 282Question →

Emily Warren Roebling stepped in to manage the construction of the Brooklyn Bridge after her husband, the chief engineer, fell ill. Although she had not been formally trained as an engineer; but she quickly mastered key concepts in engineering and materials science to guide the project to completion.

Which of the following choices best replaces the underlined portion to create a grammatically correct sentence?

Show answer & explanation

Answer: Although she had not been formally trained as an engineer, she

Answer

Although she had not been formally trained as an engineer, she
The correct option correctly uses the subordinating conjunction 'Although' to set up a dependent clause, which is separated from the main independent clause by a comma. This creates a grammatically correct sentence showing contrast.

Step-by-Step Solution

1
Analyze the relationship between the two clauses in the sentence.
The clause 'she had not been formally trained as an engineer' introduces a concession to the main action of mastering engineering concepts.
Identifying the logical relationship helps determine which conjunctions are required to link the clauses.
2
Evaluate the structure for proper subordination and coordination.
The correct structure requires either a subordinating conjunction (like 'Although') introducing a dependent clause followed by a comma and the main clause, or two independent clauses joined by a coordinating conjunction (like 'but'). It cannot use both, and a semicolon should not separate a dependent clause from an independent clause.
This ensures the sentence does not contain fragments, comma splices, or redundant conjunctions.

Key Concept

Subordination and Coordination
Question 283Question →

Peat bogs contain unique chemical properties, most notably a highly acidic compound called sphagnan. Because this substance binds with calcium, a mineral essential for microbial growth, and deprives bacteria of the nutrients they need to survive. Consequently, organic matter deposited in these wetlands can remain pristine for thousands of years.

Which of the following choices best replaces the underlined portion to ensure the sentence is grammatically complete?

Show answer & explanation

Answer: This substance binds with calcium, a mineral essential for microbial growth, and deprives bacteria of the nutrients they need to survive.

Answer

The option that removes the subordinating conjunction 'Because' and converts the clause into an independent sentence is correct. It creates a complete sentence with a subject ('This substance') and two verbs ('binds' and 'deprives') joined by a coordinating conjunction, with the appositive phrase set off by commas.
The option that removes the subordinating conjunction 'Because' and converts the clause into an independent sentence is correct. It creates a complete sentence with a subject ('This substance') and two verbs ('binds' and 'deprives') joined by a coordinating conjunction, with the appositive phrase set off by commas.

Step-by-Step Solution

1
Analyze the underlined portion to identify if it is a complete sentence or a fragment.
The original passage contains a period before 'Because' and a period after 'survive.' Because the underlined portion starts with the subordinating conjunction 'Because' and does not connect to an independent clause, it is a dependent clause fragment.
Identifying the grammatical status of the original sentence helps determine what correction is required.
2
Evaluate the option that removes the subordinating conjunction to form an independent clause.
The option starting with 'This substance binds...' removes 'Because,' creating an independent clause with the subject 'This substance' and the compound verbs 'binds' and 'deprives.' This resolves the fragment.
Removing the subordinator creates a complete, grammatically sound sentence.
3
Examine the remaining options to ensure they do not introduce new grammatical errors.
The option with the semicolon introduces a fragment after the punctuation mark, and the option with 'it deprives' creates a comma splice.
Verifying the distractors ensures that the selected option is the only grammatically correct choice.

Key Concept

Sentence Fragments
Estimated Time:1m 0s
Question 284Question →

During the annual migration, the herd of wild wildebeests travels hundreds of miles across the Serengeti to find fresh grass for their survival.

Which of the following options is the best replacement for the underlined pronoun?

Show answer & explanation

Answer: its

Answer

its
The singular possessive pronoun 'its' correctly matches the singular collective noun antecedent 'herd'. Even though the herd contains multiple wildebeests, the noun itself is grammatically singular and requires a singular pronoun.

Step-by-Step Solution

1
Identify the antecedent of the underlined pronoun.
The antecedent is the collective noun 'herd'.
To ensure correct agreement, we must first locate the noun that the pronoun is replacing or referring to.
2
Determine the grammatical number (singular or plural) of the antecedent.
The collective noun 'herd' is singular.
Although the herd consists of many wildebeests, the noun 'herd' itself functions as a single, singular unit.
3
Choose the possessive pronoun that is singular and matches the neuter gender of 'herd'.
The singular possessive pronoun is 'its'.
The pronoun must agree in number and gender with its antecedent. The plural possessive 'their' and the contraction 'they're' are incorrect, and 'its'' is not a valid word.

Key Concept

Pronoun-Antecedent Agreement
Estimated Time:45s
Question 285Question →

Read the following passage:

Many people dismiss crows as noisy pests. Although these birds actually possess remarkable intelligence, showing the ability to solve complex problems and even make their own tools.

Which choice best replaces the underlined portion to make the sentence grammatically correct?

Show answer & explanation

Answer: pests, but these birds actually

Answer

The correct answer is 'pests, but these birds actually', which correctly joins the two independent clauses with a comma and the coordinating conjunction 'but' to show contrast.
The correct choice uses the coordinating conjunction 'but' preceded by a comma to join two independent clauses. This establishes a logical contrast between how people view crows (as pests) and what they actually are (highly intelligent).

Step-by-Step Solution

1
Analyze the relationship between the two clauses: 'Many people dismiss crows as noisy pests' and 'these birds actually possess remarkable intelligence...'.
The two clauses present contrasting ideas, meaning they should be joined by a coordinating conjunction that shows contrast (like 'but') or structured as a dependent and independent clause pair.
Identifying the logical relationship is necessary to select the correct transition.
2
Evaluate the grammar and punctuation of each option.
The original sentence ('NO CHANGE') creates a sentence fragment because 'Although' makes the second clause dependent. Using a semicolon before 'because' is incorrect because semicolons must separate two independent clauses. Using 'so' is logically incorrect because it implies cause-and-effect.
Applying rules of coordination and subordination eliminates grammatically and logically incorrect options.

Key Concept

Subordination and Coordination
Question 286Question →

The following passage is about gallery design. Which present-tense form of the verb 'present' should be typed in the blank to ensure proper subject-verb agreement?

Fill in the blanks below

The curation of contemporary art exhibits requires careful planning. Each of the new gallery spaces unique challenges for the lighting design team.
Show answer & explanation

Answer

presents
The singular indefinite pronoun 'Each' acts as the subject of the sentence, which requires the singular verb form 'presents'. The plural noun 'spaces' is part of the prepositional phrase 'of the new gallery spaces' and does not affect the agreement.

Step-by-Step Solution

1
Identify the grammatical subject of the clause.
The subject is the indefinite pronoun 'Each'.
The verb must agree in number with its subject rather than any nouns in modifying phrases.
2
Determine if the subject is singular or plural.
The pronoun 'Each' is singular.
Indefinite pronouns such as 'each', 'either', and 'everyone' are grammatically singular.
3
Disregard any intervening phrases between the subject and the verb.
The prepositional phrase 'of the new gallery spaces' modifies the subject but does not change its grammatical number.
Intervening phrases often contain plural nouns that can mislead readers into choosing a plural verb.
4
Select the correct singular present-tense form of the verb.
The correct form is 'presents'.
A singular subject requires a singular verb ending in '-s' in the present tense.

Key Concept

Subject-Verb Agreement with Singular Indefinite Pronouns and Intervening Phrases
Question 287Question →

Historically, communities in arid climates have struggled to secure reliable water sources. Among the most remarkable achievements of ancient engineering, the network of subterranean aqueducts known as qanats, which was developed in Persia thousands of years ago, still supply water to communities in modern-day Iran. By tapping into mountain aquifers, these systems deliver water entirely by gravity.

Which option is the correct form of the underlined verb in the passage?

Show answer & explanation

Answer: supplies

Answer

supplies
The singular verb 'supplies' is correct because the subject of the clause is 'network', which is singular. The plural nouns 'aqueducts' and 'qanats' are object nouns within modifying phrases and do not affect the subject-verb agreement.

Step-by-Step Solution

1
Identify the subject of the verb in question.
The subject is the singular noun 'network'.
To ensure correct subject-verb agreement, we must locate the noun that performs the action.
2
Analyze intervening phrases and clauses to avoid distractor nouns.
Phrases like 'of subterranean aqueducts', 'known as qanats', and the clause 'which was developed...' contain plural nouns ('aqueducts', 'qanats', 'years'), but they are modifier phrases that do not change the singular nature of the subject 'network'.
Identifying modifier phrases prevents matching the verb to nearby plural nouns instead of the actual subject.
3
Select the verb form that matches the singular subject in the present tense.
The singular verb form is 'supplies'.
A singular subject requires a singular verb form to maintain proper grammatical agreement.

Key Concept

Subject-Verb Agreement with Intervening Phrases
Estimated Time:45s
Question 288Question →

Read the passage below and select the best revision for the underlined portion.

New Caledonian crows are famous for their ability to manufacture tools. Because they bend twigs into hooks to extract insects from tree bark.

Which of the following is the most grammatically correct revision of the underlined portion?

Show answer & explanation

Answer: They bend twigs into hooks to extract insects from tree bark.

Answer

The option that removes the subordinating conjunction to form a complete independent sentence.
The correct option removes the subordinating conjunction to turn the dependent clause into a complete, independent sentence with its own subject and verb. This resolves the sentence fragment error while maintaining the intended meaning.

Step-by-Step Solution

1
Identify the grammatical error in the underlined portion.
The clause starting with the subordinating conjunction is treated as a standalone sentence, making it a dependent clause fragment.
A dependent clause cannot stand alone as a grammatically complete sentence.
2
Evaluate the choices to find one that resolves the fragment without introducing new punctuation errors.
The revision that removes the subordinating conjunction creates a complete, independent sentence.
An independent sentence must express a complete thought and contain both a subject and a verb.

Key Concept

Identifying and correcting sentence fragments caused by dependent clauses.
Estimated Time:45s
Question 289Question →

The following passage is adapted from an article about the history of linguistics.

For decades, efforts to decipher the ancient Mayan script were stalled by the prevailing assumption that the logograms represented whole words rather than individual sounds; since linguist Yuri Knorozov proposed that the glyphs had phonetic values, and this shift in perspective eventually revolutionized the field of epigraphy.

Which choice, if substituted for the underlined portion, makes the sentence grammatically correct and logically coherent?

Show answer & explanation

Answer: when linguist Yuri Knorozov proposed that the glyphs had phonetic values, this

Answer

The correct option is the one that begins with the subordinating conjunction 'when' and connects the dependent clause to the independent clause with a comma.
The correct option is the one starting with 'when' because it properly uses the subordinating conjunction to introduce a dependent clause, which is then correctly separated by a comma from the main independent clause. This structure avoids fragments, run-ons, and comma splices, while accurately conveying the temporal and logical relationship of the events.

Step-by-Step Solution

1
Analyze the grammatical structure of the sentence after the semicolon.
The original text features 'since... and this...', which subordinates the first clause but then coordinates the next, leaving the second half of the sentence without a main independent clause.
Identifying sentence components prevents fragments and ensures proper subordination.
2
Evaluate the logical relationship between Knorozov's proposal and the subsequent revolution in epigraphy.
The relationship is temporal and causal: the proposal occurred, which then caused the shift that revolutionized the field.
Choosing the correct transition or subordinating conjunction requires understanding the logical connection between the clauses.
3
Test the options for run-ons, comma splices, and punctuation errors.
The option without any conjunctions creates a comma splice. The option with a semicolon before 'but' creates a punctuation error and uses an incorrect contrasting transition. The option starting with 'when' correctly subordinates the first clause to the main clause.
Eliminating grammatically flawed choices leads to the only correct, standard English structure.

Key Concept

Subordination and Coordination
Estimated Time:1m 0s
Question 290Question →

Although the board of directors debated the corporate restructuring proposal for hours, neither of the executive factions was willing to compromise on their demands.

Which of the following choices is the grammatically correct replacement for the underlined portion of the sentence?

Show answer & explanation

Answer: its

Answer

The correct option is the singular possessive pronoun 'its,' which properly agrees with the singular antecedent 'neither' and serves as the possessive modifier for 'demands.'
The singular indefinite pronoun 'neither' is the true grammatical antecedent in this sentence. Even though it is followed by the plural phrase 'of the executive factions,' the pronoun must remain singular. The word 'its' is the correct singular possessive pronoun needed to modify the noun 'demands.'

Step-by-Step Solution

1
Locate the pronoun being tested and identify its antecedent in the sentence.
The underlined pronoun refers back to the subject phrase 'neither of the executive factions.' The head of this phrase is the indefinite pronoun 'neither.'
Pronouns must agree in number, gender, and person with their grammatical antecedents.
2
Determine the grammatical number of the antecedent.
The indefinite pronoun 'neither' is singular. The plural noun 'factions' is part of an intervening prepositional phrase ('of the executive factions') and does not dictate the number of the pronoun.
Identifying the true singular antecedent prevents agreement errors caused by intervening plural nouns.
3
Eliminate grammatically incorrect options based on number and word function.
Eliminate the plural possessive pronoun 'their' (represented by NO CHANGE) and the plural contraction 'they're.' Next, differentiate between the singular possessive pronoun 'its' and the contraction 'it's' (it is). The sentence requires a possessive modifier for 'demands,' making 'its' the correct choice.
Choosing the correct form requires recognizing both agreement rules and homophone distinctions.

Key Concept

Pronoun-Antecedent Agreement with Singular Indefinite Pronouns
Estimated Time:45s
Question 291Question →

The panel of judicial experts, which had been assembled to review the controversial trial, was scheduled to announce their final ruling on Friday morning.

Which of the following options is the best replacement for the underlined portion?

Show answer & explanation

Answer: its

Answer

The singular possessive pronoun 'its' is the correct replacement because it agrees in number with the singular collective noun antecedent 'panel'.
The singular possessive pronoun 'its' matches the singular collective noun antecedent 'panel'. Although the phrase 'of judicial experts' contains a plural noun directly preceding the pronoun, the pronoun must agree with the head of the noun phrase, which is the singular 'panel'.

Step-by-Step Solution

1
Locate the antecedent that the underlined pronoun refers to.
The pronoun refers to 'the panel of judicial experts'. The true antecedent is the collective noun 'panel', which acts as a singular unit in this context.
Pronouns must agree in number (singular vs. plural) with the nouns they replace.
2
Simplify the sentence by temporarily removing intervening clauses and prepositional phrases.
The simplified sentence reads: 'The panel... was scheduled to announce its/their final ruling.'
The plural noun 'experts' and the relative clause 'which had been assembled...' act as distractors that separate the true subject from the pronoun.
3
Determine the correct form of the singular possessive pronoun.
'its' is possessive and singular. The option 'it's' is a contraction of 'it is', and the options containing 'their' or 'they're' are plural.
Only 'its' maintains both the singular number agreement and the possessive case required to modify 'final ruling'.

Key Concept

Pronoun-Antecedent Agreement with Collective Nouns
Question 292Question →

To prepare for the complex laboratory experiment, the students were instructed to calibrate the scale, clean the glass beakers, and they must sterilize the workspace.

Which choice best maintains the parallel structure of the sentence?

Show answer & explanation

Answer: sterilize

Answer

sterilize
The sentence presents a list of three tasks: 'to calibrate the scale,' 'clean the glass beakers,' and the final task. The first two items use bare infinitives ('calibrate' and 'clean') linked to the initial preposition 'to'. To maintain parallel structure, the third item must also be a bare infinitive. The option containing 'sterilize' correctly completes this parallel series.

Step-by-Step Solution

1
Identify the list of actions in the sentence.
The list contains 'to calibrate the scale', 'clean the glass beakers', and 'they must sterilize the workspace'.
Parallel structure requires items in a series to share the same grammatical form.
2
Determine the grammatical structure of the non-underlined list items.
The verbs 'calibrate' and 'clean' are base form verbs (bare infinitives) connected to the shared preposition 'to'.
This establishes the structure that the third item must match.
3
Select the option that matches the base form verb structure.
The verb 'sterilize' is the base form that matches 'calibrate' and 'clean'.
Using 'sterilize' completes the parallel infinitive structure.

Key Concept

Parallel Structure
Question 293Question →

During the inspection of the suspension bridge, the team leader determined that the task of checking the tension cables should be assigned to the lead technician and he, since they're experience with high-altitude rigging was unmatched.

Which of the following is the best replacement for the underlined portion of the sentence?

Show answer & explanation

Answer: him, since their

Answer

The correct option is 'him, since their'.
The correct choice replaces the subjective pronoun 'he' with the objective pronoun 'him' because it functions as a compound object of the preposition 'to'. It also replaces the contraction 'they're' (they are) with the possessive pronoun 'their' to correctly modify 'experience'.

Step-by-Step Solution

1
Analyze the role of the pronoun after the preposition 'to'.
The pronoun is part of a compound object ('assigned to the lead technician and...'). Therefore, it must be in the objective case ('him' instead of 'he').
Prepositions require objects to be in the objective case.
2
Analyze the homophone usage modifying 'experience'.
The word modifies 'experience' to show possession, so the possessive pronoun 'their' must be used instead of the contraction 'they're' (which means 'they are').
A possessive pronoun is needed to indicate ownership of the noun 'experience'.
3
Select the option that combines both correct forms.
The combination of 'him' and 'their' forms 'him, since their'.
This choice resolves both the pronoun case error and the homophone confusion.

Key Concept

Pronoun Case in Compound Objects and Possessive Pronoun Homophones
Estimated Time:1m 0s
Question 294Question →

A modern technology company has recently launched a new product. To complete the sentence with grammatically correct pronoun-antecedent agreement, which pronoun should you write in the blank?

Fill in the blanks below

The newly formed tech company, despite facing several setbacks in the first quarter, successfully released first software update to the public.
Show answer & explanation

Answer

its
The possessive pronoun 'its' correctly agrees in number with the singular antecedent 'company'.

Step-by-Step Solution

1
Identify the antecedent of the missing pronoun.
The antecedent is 'company'.
The pronoun refers back to the entity that released the software update, which is 'the newly formed tech company'.
2
Determine the grammatical number and person of the antecedent.
The noun 'company' is singular and third-person.
A single corporate entity acts as a singular unit in standard written English.
3
Choose the possessive pronoun that matches these properties.
The correct pronoun is 'its'.
The pronoun must be singular, third-person, and possessive to show ownership of the 'first software update'.

Key Concept

Pronoun-Antecedent Agreement
Question 295Question →

Read the passage below. What form of the verb 'disclose' should be written in the blank to maintain consistency in grammatical construction and avoid an incorrect shift in mood?

Fill in the blanks below

During the high-profile trial, the legal teams faced intense scrutiny from both the media and the public. In a tense courtroom session yesterday, the defense attorney insisted that the suspect be released on bail and that the prosecution all relevant evidence immediately. Ultimately, the judge denied the request, citing the severity of the charges.
Show answer & explanation

Answer

disclose
The correct answer is the base verb form 'disclose'. The sentence features parallel subordinate clauses introduced by 'insisted that'. The first clause, 'that the suspect be released on bail,' uses the subjunctive mood. To prevent an illogical shift in construction and mood, the second clause must also use the subjunctive mood, which requires the base form of the verb ('disclose').

Step-by-Step Solution

1
Identify the main verb and its grammatical influence.
The main verb governing the subordinate clauses is 'insisted'.
Verbs expressing demand, insistence, or recommendation govern the subjunctive mood in their dependent clauses.
2
Examine the mood of the first dependent clause.
The first clause is 'that the suspect be released', which is in the subjunctive mood.
This establishes the subjunctive construction (using the base form 'be') for parallel elements in the sentence.
3
Determine the correct verb form for the second dependent clause.
The second clause must also use the subjunctive mood to maintain consistency in grammatical construction and avoid a shift in mood.
To maintain parallel subjunctive construction, the base form of the verb 'disclose' is required.

Key Concept

Avoiding shifts in grammatical construction and maintaining subjunctive mood consistency
Question 296Question →

Deep inside a sandstone mountain on the Norwegian island of Spitsbergen lies the Svalbard Global Seed Vault, a secure facility designed to preserve the world's crop diversity. Which serves as a fail-safe backup against the accidental loss of seeds in traditional genebanks.

Which choice best corrects the underlined portion of the passage?

Show answer & explanation

Answer: diversity, which serves as a fail-safe backup

Answer

The option that changes the punctuation and inserts 'which serves' is correct because it properly subordinates the clause, connecting it to the independent clause as a modifier.
The correct option uses a comma followed by the relative pronoun 'which' to subordinate the clause, attaching it directly to the noun phrase it modifies ('a secure facility designed to preserve the world's crop diversity'). This resolves the sentence fragment by integrating it into a grammatically complete complex sentence.

Step-by-Step Solution

1
Identify the grammatical structure of the underlined portion and the surrounding clauses.
The clause 'Which serves as a fail-safe backup...' is a relative clause that lacks a subject/independent structure to stand on its own, making the original construction a dependent clause fragment.
Recognizing that the clause is dependent tells us that it cannot be written as a separate sentence.
2
Evaluate the punctuation and conjunctions needed to join the clauses.
Using a semicolon before a non-finite verb ('serving') creates a semicolon fragment, while placing a comma between 'diversity' and 'this vault serves' results in a comma splice because both sides would be independent clauses.
This eliminates the incorrect structural combinations.
3
Select the option that correctly integrates the dependent clause.
The choice that uses a comma followed by 'which serves' properly subordinates the clause, attaching it to the preceding independent clause as a modifier.
This creates a single, grammatically complete complex sentence.

Key Concept

Sentence Fragments
Question 297Question →

The red panda is native to the eastern Himalayas and southwestern China. Although it shares a name with the giant panda, but the two species are not closely related, as the red panda is more closely allied with weasels and raccoons.

Which choice most effectively corrects the underlined portion to establish a clear and grammatically correct relationship between the clauses?

Show answer & explanation

Answer: Although it shares a name with the giant panda, the

Answer

Although it shares a name with the giant panda, the
The correct answer properly structures the sentence by starting with the subordinating conjunction 'Although' to set up a dependent clause, which is followed by a comma and the main independent clause. This avoids the double-conjunction error present in the original sentence.

Step-by-Step Solution

1
Analyze the relationship between the clauses: 'Although it shares a name with the giant panda' and 'the two species are not closely related'.
The first clause is a dependent clause introduced by the subordinating conjunction 'Although', while the second is an independent clause.
Identifying clause types determines the appropriate punctuation and conjunctions needed to join them.
2
Check the conjunctions in the original sentence.
The original sentence contains both 'Although' and 'but'. Using both a subordinating conjunction and a coordinating conjunction to connect the same two clauses is grammatically redundant.
Eliminating redundant conjunctions ensures proper sentence structure.
3
Select the option that correctly separates the dependent clause from the independent clause using a comma.
The option that removes 'but' and keeps the comma correctly links the introductory dependent clause to the main independent clause.
An introductory dependent clause must be followed by a comma and a main clause, without an extra coordinating conjunction.

Key Concept

Subordination and Coordination
Question 298Question →

The annual migration of monarch butterflies spans thousands of miles from Canada to Mexico. A single cluster of these orange-and-black insects [underline]are[/underline] capable of covering tree trunks completely during the winter months. Which choice best corrects the underlined portion of the passage?

Show answer & explanation

Answer: is

Answer

is
The correct answer is the singular present-tense verb 'is'. The true subject of the clause is 'A single cluster', which is singular. The prepositional phrase 'of these orange-and-black insects' separates the subject from the verb but does not affect the agreement. The verb must also remain in the present tense to match the present-tense verb 'spans' established in the first sentence.

Step-by-Step Solution

1
Identify the true grammatical subject of the sentence.
The subject is the singular noun phrase 'A single cluster'.
The intervening phrase 'of these orange-and-black insects' contains a plural noun, but it acts as a prepositional modifier and does not change the singular nature of the true subject.
2
Select the verb form that agrees with the singular subject and maintains tense consistency.
The correct verb form is the singular, present-tense 'is'.
The verb must be singular to match the subject and present-tense to match 'spans' in the preceding sentence.

Key Concept

Subject-Verb Agreement
Estimated Time:45s
Question 299Question →

The wildlife biologist explained that the migration patterns of arctic terns are not only longer than any other bird species but also more complex.

Which choice is the most grammatically correct option for the underlined portion of the sentence?

Show answer & explanation

Answer: those of any other bird species

Answer

those of any other bird species
The correct option correctly uses the plural pronoun 'those' to represent 'migration patterns,' completing a parallel and logical comparison between the migration patterns of arctic terns and the migration patterns of other bird species.

Step-by-Step Solution

1
Identify the elements being compared in the sentence.
The sentence compares the 'migration patterns of arctic terns' to another element after the comparative phrase 'longer than.'
To ensure a logical comparison, the two compared items must represent the same type of concept.
2
Check the grammatical parallelism of the comparison.
The original phrase compares 'migration patterns' (a plural noun phrase) to 'any other bird species' (a noun phrase representing the birds themselves). This is an illogical comparison because a pattern cannot be compared directly to an animal.
Parallel structure requires comparing plural noun phrases using a pronoun like 'those of' or by repeating the noun.
3
Evaluate the options for correct pronoun reference and tense consistency.
Only the option using the plural pronoun 'those' to refer to 'migration patterns' resolves the illogical comparison while keeping the present tense.
This establishes a parallel and logical comparison: the migration patterns of one species are compared to the migration patterns (those) of other species.

Key Concept

Parallel Structure and Logical Comparison
Question 300Question →

The following segments describe the sequential steps in restoring an artwork. How should these segments be ordered to complete the sentence in a grammatically correct sequence that maintains parallel structure and presents the steps chronologically?

'To restore the historic painting, the conservator focused on ________, ________, and ________.'

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct chronological and parallel order is: cleaning the surface grime, repairing the torn canvas, and varnishing the completed work.
The correct order follows the logical timeline of art restoration (cleaning first, repairing second, and varnishing last) while maintaining parallel structure by using three gerund phrases ('cleaning', 'repairing', 'varnishing') that all correctly follow the preposition 'on'.

Step-by-Step Solution

1
Identify the grammatical constraint set by the sentence introduction.
The preposition 'on' requires a list of parallel gerund phrases ('cleaning', 'repairing', 'varnishing') to function as objects of the preposition.
This ensures the sentence maintains a consistent and parallel grammatical structure.
2
Determine the logical and chronological sequence of the art restoration process.
Surface cleaning must happen first, followed by structural repairs to the canvas, and finally the protective varnishing.
Varnishing cannot occur before repairing, and repairing cannot occur before cleaning the surface.
3
Assemble the segments in the determined order and verify the conjunction placement.
The resulting sentence is: 'To restore the historic painting, the conservator focused on cleaning the surface grime, repairing the torn canvas, and varnishing the completed work.'
This order places the conjunction 'and' before the final element, satisfying both chronological logic and parallel syntax.

Key Concept

Parallel Structure
Estimated Time:1m 0s
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