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

1.	Which was absent in the atmosphere at the time of origin of life?
A.	\[N{{H}_{3}}\]
B.	\[{{H}_{2}}\]
C.	\[{{O}_{2}}\]
D.	\[C{{H}_{4}}\]
Answer» D. \[C{{H}_{4}}\]

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

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