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 aminoacids were synthesized from which of the following mixtures, as observed after eighteen days?
$H_{2}, O_{2}, N_{2} \; and\; H_{2}O$
$CH_{4}, CN, H_{2} \;and \;O_{2}$
$H_{2}, NH_{3}, CH_{4}$ and water vapour
$NH_{3}, CH_{4}\; and \;O_{2}$
Two or more species occupying identical or overlapping areas are known as