There is no why.
Self replicating molecules got started at some point and got better at replicating through natural selection and dot dot dot here we are.
We may never know HOW precisely that happened as it’s hard to run sterile billion year expriments to try to get it to happen spontaneously again.
Maybe it’s happened spontaneously lots of times but if there is already more advanced life out there a fledgling proto life just becomes a snack for a bacteria or something.
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