Why do people differ in eye color, skin color?

All people are different and differ from each other in different ways, and it is impossible to find exactly two identical people on the planet. Eye and skin color are also distinctive features of people from each other. Differences between people in eye and skin color are due to the place of residence. In the northern regions, people with light eyes and skin predominate, and in the southern regions of the planet, on the contrary, with dark eyes and skin. This is how nature took care of people. People of northern latitudes have light skin tones in order to give less heat to the environment, and their eyes are light, because in northern countries there is little sunlight and protecting the retina from ultraviolet radiation is not so important, unlike people in the south, that is, brown eyes protect retina from intense sunlight. Also, the dark skin of people from the southern regions gives off heat better to the environment, thus the body does not overheat.