To cut the answer short, no one knows for sure. Yes, we have things like the “soup” theory, but that’s the thing, it’s just a theory. You also have the hydrothermal vent hypothesis which advocates argue explains some aspects of cellular function that aren’t reconciled by the primordial soup theory. All in all, which a bit of research, you will find there are a few theories which have their strengths and weaknesses but as stated earlier, no science has yet to claim a definitive answer.
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