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Why are human beings who look so differe...

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 ?

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All human beings look so different from each other in size, colour and looks due to environmental factors, new combination of genes during reproduction. All they belong to Homo sapiens and have descended from a common ancestor in Africa. They have capacity of interbreeding which is an important criteria to categorize them as one species.
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