we cannot conclude “that a single human cannot have a complex adaptation that is not universal”
You seem to have missed an important word, so I bolded it for you. A reproductively isolated population is a very different case. For example, a bunch of finches got stuck in the Galapagos a few million years ago; you might have heard of them.
we cannot conclude “that a single human cannot have a complex adaptation that is not universal”
You seem to have missed an important word, so I bolded it for you. A reproductively isolated population is a very different case. For example, a bunch of finches got stuck in the Galapagos a few million years ago; you might have heard of them.