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Largest Mass Extinction Event

APES-F9L4RR

The largest mass extinction event in Earth's history was the

A

K-T, or Cretaceous, which occurred roughly 65 MYA.

B

Triassic-Jurassic, which occurred about 200 MYA.

C

Devonian, roughly 350 MYA.

D

Ordovician-Silurian, about 440 MYA.

E

Permian-Triassic, which occurred approximately 250 MYA.