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How did oxygen first enter Earth's atmosphere? A. Meteorite impacts B. Breakdown of Precambrian rocks C. Biological processes D. Volcanic outgassing
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4 votes
How did oxygen first enter Earth's atmosphere?

A. Meteorite impacts
B. Breakdown of Precambrian rocks
C. Biological processes
D. Volcanic outgassing

User MadhavanRP
by
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1 Answer

4 votes

Answer:

I think c biological processes

User Zchpyvr
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