First you have to define “life”. There are dozens of definitions, but usually they involve consuming fuel/energy, maintaining order/integrity, growth, and reproduction.
Simple cells such as bacteria (https://en.wikipedia.org/wiki/Bacteria) are built out of CHON and maybe some trace elements (I’m not sure), and qualify as “life” as I described it above.
If you’re asking how the first bacteria came into existence, that’s a different question, with many proposed answers. But one possibility is a cell forming when the right ingredients collected in a little pocket in a rock, exposed to sunlight and nutrients.
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