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lozanna [386]
3 years ago
15

How were large amounts of oxygen first introduced into earth's atmosphere?

Geography
2 answers:
Neporo4naja [7]3 years ago
8 0
<span>c. they were produced as a byproduct of photosynthesis. </span>
arsen [322]3 years ago
3 0
<span>C. They were produced as a byproduct of photosynthesis.</span>
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