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Question

Difficulty: HardClause Boundaries and Linking

In conservation biology, the Allee effect describes a phenomenon where a population's density drops below a critical threshold, reducing the reproductive success of individual organisms. Although species with high density easily find mates, underpopulated groups often struggle to locate breeding partners _______ this isolation can lead to a rapid, self-reinforcing decline toward local extinction.

Which choice completes the text so that it conforms to the conventions of Standard English?

  1. A
    , but this
  2. ; thisAnswer
  3. C
    , this
  4. D
    this

Answer

The correct answer is '; this' because a semicolon is a grammatically standard way to join two independent clauses.
The choice containing the semicolon followed by 'this' is correct because a semicolon is a grammatically standard way to separate two closely related independent clauses. In this sentence, 'underpopulated groups often struggle to locate breeding partners' and 'this isolation can lead to a rapid, self-reinforcing decline toward local extinction' are both independent clauses, and using a semicolon successfully avoids a comma splice or run-on error.

Step-by-Step Solution

1
Analyze the structure of the passage before and after the blank.
The text before the blank contains a subordinate clause followed by a main clause ('underpopulated groups often struggle to locate breeding partners'). The text after the blank is another independent clause ('this isolation can lead to a rapid, self-reinforcing decline toward local extinction').
Identifying the clauses helps determine what type of punctuation or conjunction is needed to link them.
2
Determine the grammatical relationship between the two independent clauses.
The two independent clauses are 'underpopulated groups often struggle to locate breeding partners' and 'this isolation can lead to a rapid, self-reinforcing decline toward local extinction.' The second clause explains the consequence of the first clause.
Because they are both independent clauses, they must be separated by a semicolon, a colon, a period, or a comma followed by a coordinating conjunction.
3
Evaluate the choices based on grammatical correctness and logical meaning.
The choice with '; this' correctly uses a semicolon to link the clauses. The choice with ', this' is a comma splice, the choice with 'this' is a run-on, and the choice with ', but this' is semantically incorrect because 'but' denotes contrast rather than consequence.
Only the correct choice is both grammatically correct and semantically logical.

Key Concept

Clause Boundaries and Linking
Estimated Time:1m 30s
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Topics

Clause Boundaries and Linking

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