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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

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

asked
User MadhavanRP
by
8.9k points

1 Answer

4 votes

Answer:

I think c biological processes

answered
User Zchpyvr
by
7.7k points
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