Life isn’t a thing that you can have, living things are just a bunch of normal things that have certain traits we associate with life: autonomous movement, decision making, refueling itself (eating), reproduction.
Non living stuff mixed in the seas for a long time, until it mixed into something we would consider to be alive. The ability to reproduce is really key here, because without it we would again have to wait for another living thing to form. But since the first living thing could reproduce, it would create copies of itself, making sure life wouldn’t end.
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