At the time of the origin of life on Earth,wh | vedclass

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

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Oxygen

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(A) The early atmosphere of the Earth was a reducing atmosphere. It contained gases like $CH_4$,$NH_3$,$H_2$,and water vapor. Free oxygen $(O_2)$ was absent in the primitive atmosphere because it was consumed in the oxidation of other elements and compounds. Oxygen was later released into the atmosphere through the process of photosynthesis by cyanobacteria.

At the time of the origin of life on Earth,which of the following was absent?

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