Who proposed the theory of origin of life? What were the conditions prevailing about 3.6 billion years ago, to create life on primitive earth ?

Explanation

A.I, Oparin and J.B.S. Haldane proposed the theory of origin of life. The following conditions were prevailing about 3.6 billion years ago for creating life on primitive earth -
(i) Reducing atmosphere without the availability of free oxygen.
(ii) Presence of sufficient quantity of CH4, NH3, H2, water vapours, nitrogen and `CO_(2)`.
(iii) Abundant energy in the form of heat, cosmic rays and lightning.