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What gas important to life was abscent from earths earliest atmosphere?

User Techfoobar
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The water vapor, carbon dioxide, and methane acted as greenhouse gases, trapping heat and insulating the early Earth during a critical period in its development. Of oxygen, meanwhile, the early atmosphere held barely a trace.
User Shyam Bhagat
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don't fully quote me on this but I think it was hydrogen
User Brian Edelman
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