Which of the following was not present in fre | vedclass

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

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$O_2$

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(A) According to the Oparin-Haldane hypothesis,the early atmosphere of the Earth was reducing in nature.It contained gases like $CH_4$,$NH_3$,$H_2$,and water vapor $(H_2O)$,but it lacked free molecular oxygen $(O_2)$.Oxygen was produced later through the process of photosynthesis by cyanobacteria.

Which of the following was not present in free form at the time of the origin of life?

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