From his experiments, $S.L.$ Miller produced amino acids by mixing the following in a closed flask
$A$ : During evolution the early time period was without ozone layer. $R$ : Ozone layer absorbs $U.V.$ rays to some extent.
An experiment to prove that organic compounds were the basis of life, was performed by
The first non-cellular form of life could have originated about $. . . . .$ years ago.
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