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(D) The chemical theory of the origin of life is the most widely accepted theory.In $1953$,Stanley Miller,who was then a graduate student of Harold Ur

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Abiogenesis

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(D) The chemical theory of the origin of life is the most widely accepted theory.In $1953$,Stanley Miller,who was then a graduate student of Harold Urey $(1893-1981)$ at the University of Chicago,clearly demonstrated that ultraviolet radiation or electric discharges can produce complex organic compounds from a mixture of $CH_{4}$,$NH_{3}$,$H_{2}O$,and $H_{2}$. The ratio of methane,ammonia,and hydrogen in Miller's experiment was $2:1:2$.Experimental Evidences of Chemical Evolution:Stanley Miller and Harold Urey performed an experiment in $1953$ 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 vapor 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 ago. The first cellular form of life possibly did not originate until about $2$ billion years ago because the conditions were non-biogenic at that time. This version of abiogenesis,i.e.,the first form of life arose slowly through evolutionary forces from non-living molecules,was accepted by the majority.

The first life on the earth was developed through

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