bri3658 bri3658
  • 10-12-2019
  • History
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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
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diegoronces
diegoronces diegoronces
  • 10-12-2019
The answer is C.........
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