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

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

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User Dydil
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carbon dioxide Let me know if you want me to explain.
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User Relliv
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I think it is carbon dioxide.  I'm not sure though.
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User Sean Lin
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