There is no biological basis to the notion of human races. All humans are a single species irrespective of their race. All of them have a common body plan, structure, physiology and metabolism. All of them have a const~nt chromosome nu~ber, i.e., 46. Their genetic make up is also similar, almost 99.9% DNA 1s same in all humans. And also all the humans can freely inter-breed to produce offsprings.
Not only this, study of evolution of human beings indicates that all of us come from Africa. The earliest members of the human qspecies, Homo sapiens can be traced there.
All these evidences clearly indicates that all of us whether Africans, Asians Europeans or Americans, etc, have evolved from a common ancestor.
