[" The atmosphere of earth at the time of "],[" origin of life was "]

The atmosphere of the earth at the time of origin of life was I.reducing II.with lack of free oxygen III. oxidising IV.similar to recent atmosphere

True/False Type Questions: The atmosphere of earth was same at the time of origin of life and as present now.

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

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

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

The following gas was most likely absent from the primordial atmosphere at the time of origin of life

Atmosphere of earth just before the origin of life consisted of

Atmosphere of earth just before the origin of life consisted of