THEORY OF UNNATURAL SELECTION
My theory claims that animals and humans that have never mixed with other types of animals of the same genus, that are not hybrids, that evolved entirely on there own, remain free of any and all genetic disease and undesirable mutation.
Pure animals that have evolved solely on there own are free of any genetic ailment, condition or disease.
This is because they have evolved to fit in perfectly with their environment, there would be no reason for the animal to be mutated, like have more legs than normal or being blind or being infertile.
This means as man has so many genetic problems, like downs syndrome, adhd, spina bifida man must be a hybrid. A mix of two or more races.