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During which eon did oxygen begin to build up the most in Earth’s atmosphere? Hadean Archean Proterozoic
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During which eon did oxygen begin to build up the most in Earth’s atmosphere?

Hadean

Archean

Proterozoic

User Olvlvl
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1 Answer

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Answer: Proterozoic

Step-by-step explanation:

User Yossile
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