Too many teachers cannot, because they are ignorant. I see it, and it dead same day. They have the same number of chromosomes and genes. The dotish talk about African Race, Hindu race and Douglas is about racists expressing their stupidity. It is not talk about science.
All humans are the same species.
This is a good example of why too many of you will never become scientists. You lack the basic concepts of science and know not that you lack them. Do home work. Study with passion. You need some German attitude to work here.