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Difficulty: Very hardColons, Semicolons, and Dashes

To reconstruct the dietary habits of the extinct hominin species, the researchers analyzed three distinct sources of evidence: fossilized tooth enamel, which contains stable carbon isotopes ______ microfossil residues found on stone tools; and coprolite samples from the cave site.

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

  1. A
    isotopes, microfossil
  2. isotopes; microfossilAnswer
  3. C
    isotopes: microfossil
  4. D
    isotopes—microfossil

Answer

isotopes; microfossil
The correct option correctly uses a semicolon to separate the first two items in a complex list. Since the first item contains an internal comma and the third item is introduced with a semicolon, a semicolon is required to separate the first and second items to ensure clarity and structural consistency.

Step-by-Step Solution

1
Analyze the sentence structure to identify the list of evidence.
The sentence lists three distinct sources of evidence.
Understanding the structural elements of the sentence is necessary to determine the correct punctuation.
2
Examine the internal punctuation of the list items.
The first item ('fossilized tooth enamel, which contains stable carbon isotopes') contains an internal comma, and the third item is preceded by a semicolon.
When items in a list contain internal punctuation, standard commas are insufficient for separating the list items.
3
Apply the 'super-comma' rule for semicolons.
Semicolons must be used consistently to separate the main items in the list.
Using semicolons prevents ambiguity and maintains parallel structure in complex lists.

Key Concept

Using semicolons to separate items in a complex list (super-commas)
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Topics

Colons, Semicolons, and Dashes

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