GMAT Reading Comprehension (RC) | Conodonts, the spiky phosphatic remains (bones and teeth composed of c

how do I find information to answer the first question?

Okay, now I got it.
Lesson: right answers can be found in any paragraph.
A is too extreme because of "actually had been"
E is out because no information found
C is wrong because 1/ too extreme, not all cocodonts 2/ by definition in the first paragraph, concodont is just remains, not animals

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