Mass extinctions have occurred about 4 or 5 times in the fossil record, with the most famous example being the extinction of the dinosaurs 65 million years ago. These mass extinctions are believed to have been caused by a variety of factors, including volcanic eruptions, asteroid impacts, and climate change.

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Mass Extinctions

Question 5

Multiple Choice

Mass extinctions

A) are the result of humans damaging the natural environment.
B) are the result of humans exploiting wildlife and using pesticides.
C) occurred in cycles when organisms fail to evolve.
D) have occurred about 4 or 5 times in fossil record.
E) require life to evolve again from protocells.

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