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(A) The first cellular form of life could have originated about $2000$ million years ago.Experimental Evidences of Chemical Evolution:In $1953$,$S$.$L

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$2000$ million years back

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(A) The first cellular form of life could have originated about $2000$ million years ago.Experimental Evidences of Chemical Evolution:In $1953$,$S$.$L$. Miller and $H$.$C$. Urey performed an experiment to test the chemical theory of evolution.They created an electric discharge in a closed flask containing $CH_4$,$H_2$,$NH_3$,and water vapour at $800^{\circ}C$. They observed the formation of amino acids. In similar experiments,others observed the formation of sugars,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 originate until about $2000$ million years ago (or $2$ billion years ago) because the conditions were not suitable for biogenesis before that time. This version of biogenesis,i.e.,the first form of life arose slowly through evolutionary forces from non-living molecules,was accepted by the majority.

The first cellular form of life could have originated

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