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The atmosphere and seas of the early earth lacked oxygen. what kind of organisms could not have lived under those conditions?

The atmosphere and seas of the early earth lacked oxygen. what kind of organisms could not have lived under those conditions?
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The atmosphere and seas of the early earth lacked oxygen. what kind of organisms could not have lived under those conditions?

User Adam Lamers
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4 votes
mammals they need oxygen to breathe
User Neil Townsend
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