Why are all people near the equator black?

It is not easy to get skin cancer. And black will hinder the transformation of vitamin D, cause rickets, and increase the probability of dystocia abortion. Therefore, after leaving the equator, the race will gradually turn white, and the farther north it becomes, the whiter it becomes. For example, Mongolian and Japanese rope writers (Ainu people) of the same species as Australian short black brown people have almost the same skin color as yellow people. The white people in Italy are very close to our yellow people. Finns, Bulgarians and Hungarians who migrated from the yellow race to northern Europe have the same skin color as whites. Of course, there are also reasons to hang out with the locals.