Which of the following was absent in the atmo | vedclass

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(C) According to the Oparin-Haldane hypothesis and the Miller-Urey experiment,the early atmosphere of the Earth was reducing in nature.It contained ga

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$O_2$

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(C) According to the Oparin-Haldane hypothesis and the Miller-Urey experiment,the early atmosphere of the Earth was reducing in nature.It contained gases like methane $(CH_4)$,ammonia $(NH_3)$,hydrogen $(H_2)$,and water vapor $(H_2O)$.Free oxygen $(O_2)$ was absent in the primitive atmosphere because it was highly reactive and would have oxidized the organic molecules necessary for the origin of life.Oxygen was released later into the atmosphere through the process of photosynthesis by cyanobacteria.

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

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