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

There could be a huge debate of where the 2nd passage starts and where it ends. I even looked in official guide 2018 where it can be horridly concluded that the 2nd passage end in line 29.

I just got lost and selected a wrong answer choice. I hope I don't see such instances of bad formatting in actual GMAT.

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