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

User Scott Huang
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CARBON MONOXIDE???? im only in middle school but that is my best guess
User Dean Or
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Unlike the atmosphere today, the atmosphere 3.5 billion years ago did not contain... ozone
User Fancy
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