I do believe that is Mother Nature's intervention and wisdom.

Donkey + Horse = Mule (which is sterile)

Tiger + Lion = Liger (Males usually sterile, females may be able to reproduce)

In the movie: "The Island" starring Ewan McGregor and Scarlett Johansson, they are clones living in a sequestered area with other clones who are purchased by rich people who want available organ transplants, or a baby, etc. They escape and find out they are clones and want to live for themselves. I wonder if clones have spirituality or souls.

I think transgenders have a mental illness.

I do believe that is Mother Nature's intervention and wisdom.

Donkey + Horse = Mule (which is sterile)

Tiger + Lion = Liger (Males usually sterile, females may be able to reproduce)