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tangare [24]
3 years ago
7

During which eon did oxygen begin to build up the most in Earth’s atmosphere? a.)Phanerozoic b.)Proterozoic c.)Hadean d.)Archean

Biology
1 answer:
NNADVOKAT [17]3 years ago
5 0

phanerazoic

if there was no oxygen then why were there dinosoars

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