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History, 10.12.2019 06:31 sparky1234

Billions of years ago, how did earth come to have an oxygen-rich
atmosphere?
a. volcanic outgassing
b. comet impacts
c. algae activity
d. earth's cooling
e previous

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Answers: 2
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Billions of years ago, how did earth come to have an oxygen-rich
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a. volcani...
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