Which organisms were free swimmers and found in a great variety of Paleozoic and Mesozoic marine habitats?
A)ammonoids and conodonts
B)chitnozoans and graptolites
C)diatoms and diatoms
D)flatclams and trilobites

Question

Quizplus · Accepted Answer

Ammonoids and conodonts were free swimmers and found in a great variety of Paleozoic and Mesozoic marine habitats. Chitinozoans and graptolites were small, planktonic organisms and not free swimmers. Diatoms and diatoms are not organisms but a type of algae. Flatclams and trilobites were benthic organisms and not free swimmers.

Which Organisms Were Free Swimmers and Found in a Great