Mass extinctions have occurred about 4 or 5 times in the fossil record, and they were due in some cases to catastrophic changes such as asteroid impacts or massive volcanic eruptions. Humans may contribute to a potential future mass extinction, but they are not the cause of past ones.

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Mass Extinctions

Question 15

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,due in some cases to catastrophic changes.
E) require life to evolve again from protocells.

Correct Answer: