Which of the following combined with methane | vedclass

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(C) According to the Oparin-Haldane hypothesis regarding the origin of life,the early Earth's atmosphere was reducing in nature.It contained gases lik

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Oxygen

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(C) According to the Oparin-Haldane hypothesis regarding the origin of life,the early Earth's atmosphere was reducing in nature.It contained gases like methane $(CH_4)$,ammonia $(NH_3)$,and water vapor $(H_2O)$.Oxygen $(O_2)$ was not present in the free state in the early atmosphere.However,free oxygen combined with methane and ammonia to form water $(H_2O)$,carbon dioxide $(CO_2)$,and other compounds as the atmosphere transitioned from a reducing to an oxidizing environment.

Which of the following combined with methane and ammonia to form water,$CO_2$ and others on early Earth?

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