Nature. DNA is unstable. Lots of stuff cause mutations: background radiation, chemicals, viruses, even our own normal metabolism [1]. [1] https://en.wikipedia

Nature. DNA is unstable. Lots of stuff cause mutations: background radiation, chemicals, viruses, even our own normal metabolism [1]. [1] https://en.wikipedia.org/wiki/Reactive_oxygen_species#Oxidative_damage https://en.wikipedia.org/wiki/Reactive_oxygen_species#Oxidat...