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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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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

User Hamid Rouhani
by
8.1k points

1 Answer

7 votes
The answer is C.........
User GlaIZier
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7.5k points
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