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

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6.Evolution

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

A

$N H_{3}$

B

$H _{2}$

C

$O _{2}$

D

$CH _{2}$

Solution

Primitive atmosphere of earth was reducing containing methane, ammonia, hydrogen and water vapour. There was no free oxygen.

Standard 12

Biology

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