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Difficulty: MediumSubject-Verb Agreement

The dynamic interactions between a host organism and its gut microbiome, which consists of trillions of microscopic bacteria, helps regulate the host's metabolic functions. This complex symbiotic relationship influences everything from nutrient absorption to immune system development.

Which choice is the most grammatically correct replacement for the underlined word?

  1. A
    NO CHANGE
  2. helpAnswer
  3. C
    has helped
  4. D
    helped

Answer

The correct verb form is the plural present-tense 'help' because the subject of the sentence, 'interactions', is plural.
The correct choice is the plural verb 'help' because the subject of the verb is the plural noun 'interactions'. Modifying elements like 'between a host organism and its gut microbiome' and 'which consists of trillions of microscopic bacteria' separate the subject from the verb but do not affect the agreement.

Step-by-Step Solution

1
Locate the grammatical subject of the clause.
The subject is the plural noun 'interactions'.
The verb must agree in number with this main noun rather than any nearby nouns.
2
Identify and temporarily ignore any intervening modifier phrases or clauses between the subject and the verb.
The prepositional phrase 'between a host organism and its gut microbiome' and the relative clause 'which consists of trillions of microscopic bacteria' both modify 'interactions' but do not change its plural nature.
Nouns within modifying phrases (like 'microbiome' or 'organism') cannot function as the subject of the main verb.
3
Select the verb form that matches the plural subject and respects the established tense of the passage.
The plural present-tense form 'help' matches the plural subject 'interactions' and maintains consistency with other present-tense verbs in the passage like 'consists' and 'influences'.
This avoids both subject-verb agreement errors and unnecessary tense shifts.

Key Concept

Subject-verb agreement requires a plural subject to take a plural verb, even when separated by intervening modifying phrases or clauses.
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Topics

Subject-Verb Agreement

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