Unlike the atmosphere today, the atmosphere 3.5 billion years ago did not contain...?

asked Jun 24, 2017 36.9k views

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2 votes

CARBON MONOXIDE???? im only in middle school but that is my best guess

Dean Or answered Jun 27, 2017

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3 votes

Unlike the atmosphere today, the atmosphere 3.5 billion years ago did not contain... ozone

Fancy answered Jun 28, 2017

by Fancy

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