Question : Identify the segment that contains a grammatical error. If there is no error, select 'No error'. The timescale of prokaryote evolution / have been difficult to reconstruct / because of a limited fossil record.
Option 1: because of a limited fossil record.
Option 2: The timescale of prokaryote evolution
Option 3: have been difficult to reconstruct
Option 4: No error
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Correct Answer: have been difficult to reconstruct
Solution : The third option is correct.
Explanation : The original sentence has a subject-verb agreement issue. The timescale is a singular subject , but the verb "have been " is plural. It should be " has been " to match the singular subject timescale.
Therefore, the correct sentence should be: "The timescale of prokaryote evolution has been difficult to reconstruct because of a limited fossil record."
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