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How many sterilizing impacts have occurred on the Earth since the heavy bombardment?

adreamer

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How many sterilizing impacts have occurred on the Earth since the heavy bombardment?

How many sterilizing impacts have occurred on the Earth since the heavy bombardment?
A) several during the last 500 million years
B) many throughout the Earth's history
C) none
D) one, 65 million years ago

Textbook

Life in the Universe

Life in the Universe

Edition: 4^th

Authors: Bennett, Shostak

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19Clyde

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