Significant mass extinctions occurred during which of the following epochs?
A. Pleistocene, Ordovician, and Triassic
B. Ordovician, Triassic, and Jurassic
C. Triassic, Permian, and Cretaceous
D. Triassic, Permian, Cretaceous, Pleistocene, Ordovician, and Devonian
E. Ordovician, Triassic, Jurassic, Silurian, Eocene, and Oligocene
Answer: D. Triassic, Permian, Cretaceous, Pleistocene, Ordovician, and Devonian
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