Origin of earth dates back to

Which of the following breakup water into hydrogen and oxygen on early earth?

Write an explanatory note on origin of life.
 

An experiment to prove that organic compounds were the basis of life, was performed by

The complex organic compounds that may have first evolved in the direction of origin of life on earth, may have been

Assertion : The primitive atmosphere was reducing one i.e., without oxygen.

Reason : In the primitive atmosphere, oxygen was involved in forming ozone