Devolution

[Mister Agenda]

Every atom in the universe is the result of combination of other atoms. Totally random outside of a lab.

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So, since there was no Design involved, we exist because of uncountable random accidents all taking place at the same time- and in the right sequence!

heh

We exist because natural selection conserves mutations that allow successful reproduction and culls mutations that lower the chances of successful reproduction, and ignores neutral mutations that can cause speciation from genetic drift alone. Read a textbook on evolutionary biology would be my recommendation.