Earth isn’t really that big, if you think about it. Biodiversity on Earth is really a wide span.
In: Biology
Because of evolutionary adaptation.
People with darker skin have more melanin to protect them from the sun. The opposite goes for very light skinned people in cold countries, where as much sun should be absorbed by the skin as possible. Facial features like thin/full lips for heat regulation. Usually a mass of people who all evolved in the same way due to their environment look similar and continue to evolve more in this direction, whereas people from other parts of the world evolved in a different way.
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