When did life originate on Earth?

Assertion: The primitive atmosphere was a reducing one,i.e.,without oxygen.
Reason: In the primitive atmosphere,oxygen was involved in forming ozone.

In his classic experiment on the formation of amino acids,Stanley Miller passed an electric discharge in a mixture of

What was the contribution of the scientist Van Helmont?

Select the statement which is '$NOT$' true about the Big Bang Theory.

Select the wrong pair.