answer:I’ll give it a shot. We know humans have been evolving for 1 to 2 million years (pick your starting point), but only left Africa 100,000 to 200,000 years ago. Our early ancestors had much more time to evolve bodily functions optimized for that type of climate and surroundings. There is an area in Western NY that still has primal forest. I’ll bet there are all kinds of good stuff growing there that benefited the Paleo-Indians.