Question

Which was absent in the atmosphere at the time of origin of life ?(a) NH₃(b) H₂(c) O₂(d) CH₄

Answer 1

Hey mate here is your answer

Correct Option (c) O2

Explanation:

The atmosphere of earth at the time of origin of life was without free oxygen atoms. The primitive atmosphere chiefly consisted of methane, ammonia, water vapour, hydrogen gas, nitrogen gas, and some carbon monoxide.

Hydrogen atoms were most numerous and most reactive in primitive atmosphere. They combined with all available oxygen atoms and formed water.

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