Because of how the laws of physics are, carbon atoms love to join other atoms together in these big long complex molecules.
Some of those other atoms are reactive, and so maybe when that big carbon based molecule bumps into some other atoms or molecules they can react and “do stuff”.
You have all these random molecules being formed continuously over hundreds of millions of years. Eventually maybe one of these molecules is shaped specially enough that it can “collect” other specific atoms and then pop out a copy of itself.
As soon as this happens you have survival of the fittest – this self copying molecule will be competing for resources, and because the copying process would never be perfect new versions of it could appear that were even better at gathering resources.
Very quickly these molecules will improve through random mutations, getting better and better at gathering resources and protecting itself from being absorbed by other self replicating molecules. Aka “evolution”.
Do this for long enough and you get cells and finally complex life.
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