How many mass extinctions have occurred over the last 500 million years?
A) 5
B) 1
C) 4
D) 3

Name: How many mass extinctions have occurred over the last 500 million years? A) 5 B) 1 C) 4 D) 3
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Question

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There have been 5 major mass extinctions over the last 500 million years, known as the "Big Five." These include the Ordovician-Silurian, Late Devonian, Permian-Triassic, Triassic-Jurassic, and Cretaceous-Paleogene extinctions.

How Many Mass Extinctions Have Occurred Over the Last 500