According to one of the most widely accepted theories, earth's atmosphere before origin of life was\

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Professor PC Thomas Classes · Answer

(d) : The atmosphere of earth before origin of life was strongly reducing (without free oxygen). At high temperature, free atoms combined to form molecules and simple inorganic compounds. Hydrogen, oxygen, carbon and nitrogen could not exist in free state and thus combined variously either among themselves or like $\mathrm{CH}_{4^{\prime}} \mathrm{NH}_{3}, \mathrm{H}_{2}$ and $\mathrm{H}_{2} \mathrm{O}$ vapour.