Which organisms were benthic (bottom dwellers)and extensively used as index fossils respectively for the Mesozoic and Lower Paleozoic?
A)ammonoids and conodonts
B)chitnozoans and graptolites
C)diatoms and diatoms
D)flatclams and trilobites

Question

Quizplus · Accepted Answer

Flatclams were benthic organisms in the Mesozoic, and trilobites were extensively used as index fossils in the Lower Paleozoic.

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