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Zorluk: OrtaCommas with Lists, Clauses, and Coordinate Adjectives

During a deep-sea expedition off the Galápagos Rift, marine biologists documented dense, thriving communities of giant tube worms, and they gathered hydrothermal fluid samples to measure chemical compositions.

Which choice best conforms to the conventions of Standard English punctuation for the underlined portion?

  1. dense, thriving communities of giant tube worms, and they gatheredCevap
  2. B
    dense, thriving communities of giant tube worms, they gathered
  3. C
    dense, thriving communities of giant tube worms; while they gathered
  4. D
    dense, thriving communities, of giant tube worms, and they gathered

Cevap

The original phrasing is correct because it appropriately places a comma between the coordinate adjectives 'dense' and 'thriving' and uses a comma before the coordinating conjunction 'and' to connect two complete independent clauses.
The original phrasing correctly applies two distinct comma rules: first, it uses a comma to separate the coordinate adjectives 'dense' and 'thriving', which both independently modify 'communities'. Second, it correctly uses a comma before the coordinating conjunction 'and' to join two independent clauses ('marine biologists documented...' and 'they gathered...').

Adım Adım Çözüm

1
Evaluate the adjectives preceding 'communities'.
The adjectives 'dense' and 'thriving' independently modify 'communities' (e.g., 'dense and thriving communities'). Therefore, they are coordinate adjectives and require a comma between them.
Coordinate adjectives modifying the same noun must be separated by a comma or a coordinating conjunction.
2
Analyze the clause structure on either side of the conjunction.
'marine biologists documented...' and 'they gathered...' are both complete independent clauses capable of standing alone as sentences.
When two independent clauses are joined by a coordinating conjunction (such as 'and'), a comma must precede the conjunction.
3
Verify prepositional phrase boundary integrity.
The phrase 'of giant tube worms' restricts and clarifies 'communities', so no comma should separate 'communities' from 'of'.
Commas should not separate a head noun from an essential prepositional modifier.

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Commas with Coordinate Adjectives and Independent Clauses
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Commas with Lists, Clauses, and Coordinate Adjectives

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