Over the past 400 years,humans have documented the extinction of more than species.This modern rate of species extinction is estimated to be the normal extinction rate seen in the fossil record.
A) 400 ...about double
B) 1,000 ...over 100 times greater than
C) 100 ...about the same as
D) 10,000 ...at least 1 million times greater than
Correct Answer:
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