Carbon naturally forms complex organic molecules. Sometimes these molecules are able to react with each other. It’s conceivable that a complex molecule could form that attracts simple molecules in a way that forces them to form together as a copy of itself.
You then have a situation where you have these large molecules competing with each other for resources to make more copies of themselves, and because they are relatively simple the copying process is error prone leading to lots of mutations.
Sounds familiar? We have everything we need for evolution to begin and evolve life as we know it.
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