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Biology, 27.01.2020 20:31 cchotshot

What is true of mass extinctions?
a all life on earth dies when a mass extinction happens
b in each mass extinction, over 50% of animal species died.
c mass extinctions happen frequently.
d there is no evidence for past mass extinctions.

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What is true of mass extinctions?
a all life on earth dies when a mass extinction happens
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