Just look at the endless type of tiny dog breeds that could not survive a day by themselves in the wild. If humans are able to breed this many types of different animals out of one species, why wouldn't the same happen in nature?
Nature simply kills off the ones that can't survive or adapt and the rest will keep evolving further or die out once they are unable to adapt to any changes in the environment.
“It appeared that there had even been demonstrations to thank Big Brother for raising the chocolate ration to twenty grams a week. And only yesterday, he reflected, it had been announced that the ration was to be reduced to twenty grams a week. Was it possible that they could swallow that, after only twenty-four hours? Yes, they swallowed it.”
- George Orwell, ‘1984’
