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The human beings who look so different f...

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

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Human beings are said to belong to the same species because of the following reasons:
a] DNA studies.
b] Number of chromosome is same
c] All have a common ancestor.
d] They interbreed among themselves to produce fertile young ones of their own kind.
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