You are asking a very deep fundamental question for which there is no ELI5. It’s a hard question to answer even without an ELI5 constraint.
But you can ask the same about a river: how did seemingly innocent H2O molecules lead to a river that seems “alive”? It flows, it changes path over time, it can even cease to exist. It is a very complex thing that exists because of many properties of matter and forces that somehow end up creating a river somewhere. Or you can ask the same about stars.
Life is kind of the same thing, an emergent property of otherwise simple carbon matter given its properties and the forces acting on it.
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