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I disagree that the existence of epigenetics disproves genetics. Biology is incomprehensibly complex, and both genetics and epigenetics are aspects of that complexity. The ability of bacteria to transfer DNA between them does not disprove sexual reproduction. Both happen.

sounds like nihilism

It's just how things work. It's not a philosophy.

dialectic materialism? is how it works?

What's your point? That observation that things exist is some kind of sophistry?