Who proposed the Big Bang Theory?

The scientist associated with the overthrow of the "Theory of Spontaneous Generation" through experiments with swan-necked flasks is:

What was the ratio of methane,ammonia,and hydrogen in Miller's experiment?

In his experiments for the origin of life,Miller obtained

According to which theory, all living organisms that we see today were created in this same form?

Read the following statements and find out the correct ones:
$A.$ Spontaneous generation theory was approved once and for all.
$B.$ Pasteur showed that in pre-sterilized flasks,life did not come from killed yeast.
$C.$ Oparin observed the formation of amino acids by creating electric discharge in a closed flask.
$D.$ Life appeared $500$ million years before the formation of the earth.