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$2000$ million years.

Experimental Evidences of Chemical Evolution

Experi ik mentally chemical theory of evolution performed by SL Miller and HC

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$2000$ million years back

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$2000$ million years.

Experimental Evidences of Chemical Evolution

Experi ik mentally chemical theory of evolution performed by SL Miller and HC Uray in $1953 .$

He created electric discharge in a closed flask containing $CH _{4}, H _{2}, N H _{3}$ and water vapour at $800\, C .$ He observed formation of amino acids. In similar experiments other the observed, formation of sugar, nitrogen bases, pigments and fats

The first non-cellular forms of life could have originated-$3$ billion years back. The first cellular form of life did not possibly originated till about $2$ billion years ago because the conditions were non-biogenic at that time. This version of biogenesis, $i.e.,$ the first form of life arose slowly through evolutionary forces from non-living molecule was accepted by majority

Column- $I$	Column- $II$
$A.$ $500$ million years ago	$1.$ Sea weeds and few plants
$B.$ $350$ million years ago	$2.$ Jawless fishes
$C.$ $320$ million years ago.	$3.$ Inverbebrates

The first cellular form of life could have originated

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Match the following columns.

Column- $I$

Column- $II$

$A.$ $500$ million years ago

$1.$ Sea weeds and few plants

$B.$ $350$ million years ago

$2.$ Jawless fishes

$C.$ $320$ million years ago.

$3.$ Inverbebrates

The Permian period, during which the first most modern orders of insects appeared, occurred approximately