Which of the following was absent in the free | vedclass

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(D) The primitive atmosphere of the Earth was reducing in nature. It contained gases like $CH_4$ (Methane),$NH_3$ (Ammonia),$H_2$ (Hydrogen),and water

Vedclass · Accepted Answer

Oxygen

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(D) The primitive atmosphere of the Earth was reducing in nature. It contained gases like $CH_4$ (Methane),$NH_3$ (Ammonia),$H_2$ (Hydrogen),and water vapor. Free oxygen $(O_2)$ was absent in the primitive atmosphere because it was highly reactive and was consumed in the formation of water and oxides of other elements. Oxygen was released later into the atmosphere through the process of photosynthesis by cyanobacteria.

Which of the following was absent in the free form in the primitive atmosphere at the time of the origin of life?

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