As an artist, though, I am able to see and appreciate the differences and beauty in everyone I run across. It's a good question. Blacks come from a hot climate. Our behinds are larger to store fat in a place where we can stay cool rather than on legs or arms. We tend to be taller because taller, lean bodies dissipate heat better.
Straight hair warms the head and neck.
There is a biological reason why our lips are larger. I'd love to know the answer. Black people seem to have the largest features of all the races because of adaptation. If you are willing to know the true answer, you must study. Black people tend to have the larger features because when we were in Africa, we had to adapt to the hot climates.