Question

According to one of the most accepted theory the earth atmosphere before any life had originated consisted of water vapour, hydrogen, NH3​ and
(a) Methane
(b) Nitrogen
(c) Oxygen
(d) Carbon dioxide

Answer 1

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carbon dioxide

Explanation:

The early atmosphere was probably mostly carbon dioxide, with little or no oxygen. There were smaller proportions of water vapour, ammonia and methane. As the Earth cooled down, most of the water vapour condensed and formed the oceans.

Answer 2

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$\tt \: option \: (d)$