Which type of microfossils have a tooth- like shape made of apatite, are a mouth part of an extinct swimming eel- like chordate, and are useful index fossils for the Paleozoic through Triassic?
A) conodonts
B) acritarchs and dinoflagellates
C) diatoms and radiolaria
D) coccoliths and formaminifera
Correct Answer:
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