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MrRissso [65]
3 years ago
14

Where did earth's oxygen come from? select one:

Biology
1 answer:
Vedmedyk [2.9K]3 years ago
5 0
Hello, the answer to the question that you asked is:
<span>c. produced by microscopic life over a billion years.
</span>Hope this helps please award brainly :)
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