Question

despite of difference in looks colour size why human beings are said to belong to the same species​

Answer 1

Answer:

All human beings, even though they have different size, colour and looks, belong to the same species because they have similar DNA sequences and have descended from same ancestors. Also, they are capable of reproducing among themselves.

Explanation:

Answer 2

Over the recent years, the evidence has become clear. There is no biological basis to the notion of human races. All humans are a single species. Regardless of where we have lived for the past thousand years, we all come from Africa. The earliest members of the human species, Homo sapiens, can be traced there. Our genetic footprints can be traced back to our African roots.