Scientists believe that the Earth's early atmosphere lacked __________ gas because photosynthetic organisms did not yet exist.

asked Feb 19, 2018 93.5k views

4 votes

by Dydil

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6 votes

carbon dioxide Let me know if you want me to explain.

Relliv answered Feb 22, 2018

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I think it is carbon dioxide. I'm not sure though.

Sean Lin answered Feb 25, 2018