question_answer

According to one of the most accepted theory, the earth atmosphere before any life had originated consisted of \[{{H}_{2}}O,\,{{H}_{2}},\,N{{H}_{2}}\] and :

A)  \[C{{H}_{4}}\]                  

B)         \[{{O}_{2}}\]

C)  \[{{N}_{2}}\]                    

D)         none of these