Explaining Human Skin Color

the level of sun radiation / fire / warm weather / changes a population skin color over time. the 'Lucy' likes, antrophormophic apes, were something like light-brown skinned. the black people of africa are black because they stood too much time in Africa with a lot of sun all the time, with no place to hide under shadow. The arabian got more or less warm and cold, and became light-brown skinned. While the european people in the winter and cold, took less sun radiation, fire, warm in their skin, and became more and more white and blonde. simple as that.