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

Hadean

Phanerozoic

Archean

Proterozoic

User Wenjie
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2 Answers

4 votes

Answer:

Proterozoic eon

User Joshwaa
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5 votes
during the phanerozoic eon
User Jsshah
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