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Difficulty: HardCommas with Lists, Clauses, and Coordinate Adjectives

While exploring the depths of the Mariana Trench, the oceanographers observed several rare, bioluminescent fish species, and they documented the organisms' behavioral patterns.

Which choice best punctuates the underlined portion of the sentence?

  1. NO CHANGEAnswer
  2. B
    rare, bioluminescent, fish species and they documented
  3. C
    rare bioluminescent fish species, they documented
  4. D
    rare, bioluminescent fish species; documenting

Answer

The correct option is 'NO CHANGE' because it properly places a comma between the coordinate adjectives 'rare' and 'bioluminescent', avoids a comma between the adjective and the noun phrase 'fish species', and correctly uses a comma before the coordinating conjunction 'and' to join two independent clauses.
The correct choice properly applies comma rules for both coordinate adjectives and independent clauses. The adjectives 'rare' and 'bioluminescent' are coordinate, meaning they modify 'fish species' individually and can be separated by a comma. There should be no comma after 'bioluminescent' because it modifies the noun phrase 'fish species'. Additionally, the coordinating conjunction 'and' is preceded by a comma because it connects two independent clauses.

Step-by-Step Solution

1
Determine if the adjectives modifying 'fish species' are coordinate or cumulative.
The adjectives 'rare' and 'bioluminescent' are coordinate because they can be reversed ('bioluminescent, rare fish species') or joined by 'and' ('rare and bioluminescent fish species') naturally. However, 'fish' is cumulative/part of the noun phrase 'fish species' and cannot be reversed with the other adjectives, so there should be a comma only between 'rare' and 'bioluminescent', and no comma after 'bioluminescent'.
Coordinate adjectives require a comma between them, while cumulative adjectives or adjectives directly modifying the noun should not be separated from the noun by a comma.
2
Identify the clause structure after the underlined portion to determine the correct punctuation and conjunction.
The sentence consists of two independent clauses: 'the oceanographers observed several...' and 'they documented the organisms' behavioral patterns.' These clauses must be joined by a comma and a coordinating conjunction (such as 'and'), or by a semicolon.
Joining two independent clauses with only a comma creates a comma splice, while separating them with a semicolon and a non-finite verb form creates a fragment.
3
Evaluate the options to find the one that meets both punctuation requirements.
Only the original phrasing ('NO CHANGE') correctly uses a comma between the coordinate adjectives and a comma before the coordinating conjunction 'and' to join the independent clauses.
This maintains grammatical correctness and avoids comma splices, misplaced commas, and fragments.

Key Concept

Commas with Lists, Clauses, and Coordinate Adjectives
Estimated Time:1m 0s
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Topics

Commas with Lists, Clauses, and Coordinate Adjectives

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