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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
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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.

User Utku Zihnioglu
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The answer is 1,000 . . . over 100 times greater than
or c
User Aberrant
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