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The ends of the geologic eras such as the Paleozoic and Mesozoic are marked by A. mass extinctions. B. index fossils. C. radioactive decay. D. climate changes.
The ends of the geologic eras such as the Paleozoic and Mesozoic are marked by mass extinctions.
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stan_r|Points 1382|
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Asked 12/17/2015 6:49:15 AM
Updated 12/17/2015 7:10:47 AM
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Edited by jeifunk [12/17/2015 7:10:46 AM], Confirmed by jeifunk [12/17/2015 7:10:47 AM]
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