>>14035574>Why does it matter how many continents we live on? We hop around so much there is no opportunity for speciation.Because no we don't, that's just a meme. Moving around wasn't easy, it was slow and when it happened most of the population stayed behind. That's why we're not all brown. We had the opportunity to evolve different phenotypes because we lived mostly in geographical isolation and gene flow, while it existed, was very limited.
Also, we might be the only species with planes, but we're far from the only species that was "hopping around". One good example, again, is the grey wolf, which is a very mobile animal that often moves hundred of kilometres in search of a territory, and has a marked tendency to interbreed with different groups, even different species. They had a genetic bottleneck around 20 000 years ago and then repopulated eurasia and north america. Did they move too much to be classified into subspecies ? No, there's 38 of them.
Oh wait did you mean that the invention of planes, trains and automobiles cancelled our genetic differentiation ?
