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(C) According to the Oparin-Haldane hypothesis,the early atmosphere of the Earth was a reducing atmosphere. It contained gases like $CH_4$,$NH_3$,$H_2

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$O_2$

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(C) According to the Oparin-Haldane hypothesis,the early atmosphere of the Earth was a reducing atmosphere. It contained gases like $CH_4$,$NH_3$,$H_2$,and water vapor,but it lacked free molecular oxygen $(O_2)$. Oxygen was produced later through the process of photosynthesis by cyanobacteria.

What was absent in the atmosphere during the origin of life?

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