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The first major source of oxygen gas
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4 votes
The first major source of oxygen gas

User Felene
by
7.5k points

2 Answers

3 votes
it is going to be h2s:-)
User Kjuly
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8.2k points
1 vote
I would say trees and plants. They take the carbon dioxide out of our air and replace it would breathable oxygen. Hope this helps!
User Quantum
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8.2k points
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