Why are human beings who look so different from each other in terms of size, colour and looks said to belong to the same species?

Q. Why are human beings who look so different from each other in terms of size, colour and looks said to belong to the same species? 

 

Answer:-

The human beings are different from each other in terms of size, colour but are said to belong to the same species. This is because, despite of great diversity of human forms and features in different human races across the planet, the genetic footprints of all human beings can be traced back to same common ancestry of African roots. All humans are a single species and have originated from Homo sapiens, who were the earliest members of the human species in Africa. As there have been no well set geographical or reproductive isolation among different members of human species, this has lead to numerous genetic makeups of traits with slight variation.