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your dna is not solid, it never was

Other than mutations, the DNA I was born with is the DNA I will die with [Edit: or the deliberate imposition of genetic therapy]. I do not know what you mean by 'solid' in this context.

geneticists have already admitted that they have disproved themselves - or what is epigenetics? - but they just forgot to tell the virologists...

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?