Why do foreigners have blond hair and black hair? ,

In fact, the color of the yellow race and the black race is very single, and they are both dark and dark, mainly because the birthplace of these two races is low in dimension and distributed in the equator and north and south temperate zones. These places have strong sunshine and heavy ultraviolet radiation, so the hair color is black and can keep healthy.

And you said the hair was messy, mainly white. This kind of people originated in high latitudes, near the cold zone. This generation of sunshine is not so strong, and hair color is not important, so there is no directional choice of hair color in natural selection, and the hair color is rather mixed.