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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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A species is a group of organisms that are capable of inter breeding to produce a fertile offspring. Skin colour, looks and size are all variety of features present in human beings. These features are generally environmentally controlled. Various human races are formed based on their features. However there is no biological basis to their concept ofraces. Therefore, all human beings are a single species as human beings of different colour, size and looks are capable ofreproduction and can produce a fertile offspring.
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