BY8 Mutation and reproductive success

I think it’s technically where an animal when it’s born mutates and the chance it has of surviving, if it does survive, and it breeds again, its offspring carry the same DNA which then slowly carries on into a bigger amount of that animal. If it survives, it breeds again and its offspring can have the same mutated cells as the first animal and slowly that species of that animal gets bigger and bigger. I think it happens, just an accident, when cells are copying each other, but I think the animal survives because it can adapt better to its environment so it’s less likely to get hunted by predators. I think it could adapt where it can camouflage into its surroundings or even be stronger for where it lives in the world.