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Difficulty: MediumParallel Structure

Deep-sea hydrothermal vents support unique organisms, recycle crucial nutrients, and they are generating heat through chemical reactions.

Which choice best maintains the parallel structure in the sentence?

  1. A
    NO CHANGE
  2. generateAnswer
  3. C
    generating
  4. D
    to generate

Answer

generate
The correct option maintains parallel structure by using the simple present verb 'generate' to match the other verbs in the series, 'support' and 'recycle.'

Step-by-Step Solution

1
Identify the verbs in the list or series.
The series contains three actions: 'support' (simple present verb), 'recycle' (simple present verb), and the underlined segment.
Parallel structure requires items in a list or series to have the same grammatical form.
2
Analyze the underlined segment 'they are generating'.
This segment uses a pronoun and a progressive verb, which does not match the active, simple present verb forms of 'support' and 'recycle'.
Identifying the mismatch allows us to find the correct parallel grammatical category.
3
Select the option that matches the simple present verb form.
The verb 'generate' is a simple present verb, completing the parallel sequence: 'support,' 'recycle,' and 'generate.'
Using 'generate' ensures grammatical consistency and parallel structure throughout the list.

Key Concept

Parallel Structure in lists requires all items to share the same grammatical form (e.g., all nouns, all infinitives, or all verbs in the same tense).
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Topics

Parallel Structure

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