Mass extinctions have occurred in the last .
A) five times; 4.5 million years
B) six times; 4.5 billion years
C) only once; 66.5 million years
D) five times; 450 million years

Name: Mass extinctions have occurred in the last . A) five times; 4.5 million years B) six times; 4.5 billion years C) only once; 66.5 million years D) five times; 450 million years
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Mass extinctions have occurred five times over the last 450 million years, marking significant and widespread losses in biodiversity.

Mass Extinctions Have Occurred in the Last