Who proposed the Big Bang theory?

The early atmosphere contained methane and other hydrocarbons. They have now been replaced by:

Stanley Miller had put the Oparin-Haldane theory to test in $1953$ by creating in the laboratory the probable conditions on the primitive earth. In the experiment,simple amino acids were synthesized from which of the following mixtures,as observed after eighteen days?

Who rejected the theory of abiogenesis?

The first organisms to appear on Earth were more like plants because:

Name the first organisms that invaded land.