Which of the following was most likely to hav | vedclass

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(A) The primordial atmosphere of the Earth was reducing in nature.It contained gases like $CH_4$,$NH_3$,$H_2$,and water vapor.Free oxygen $(O_2)$ was

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$O_2$

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(A) The primordial atmosphere of the Earth was reducing in nature.It contained gases like $CH_4$,$NH_3$,$H_2$,and water vapor.Free oxygen $(O_2)$ was absent because it was highly reactive and would have immediately combined with other elements to form oxides.Oxygen was later released into the atmosphere by photosynthetic organisms (cyanobacteria) during the process of oxygenic photosynthesis.

Which of the following was most likely to have been absent in free form in the primordial atmosphere at the time of the origin of life?

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