The first non-cellular form of life could have originated about $. . . . .$ years ago.
$3 \;million$
$2\; million$
$3\; billion$
$2\; billion$
They would have been giant molecules ($RNA, DNA$, Polysaccharides, etc.,)
From his experiments, $S.L.$ Miller produced amino acids by mixing the following in a closed flask
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