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Which Organisms Were Benthic (Bottom Dwellers) and Extensively Used as Index

Question 42

Multiple Choice

Which organisms were benthic (bottom dwellers) and extensively used as index fossils respectively for the Mesozoic and Lower Paleozoic?

A) ammonoids and conodonts
B) flatclams and trilobites
C) chitnozoans and graptolites
D) diatoms and diatoms

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