ELI5- Why are people on Earth so drastically different looking from one another?

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Earth isn’t really that big, if you think about it. Biodiversity on Earth is really a wide span.

In: Biology

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Anonymous 0 Comments

Earth is plenty big enough for biodiversity. Forget the past 200 years. Before vehicles, it was incredibly time consuming to travel long distances. Population Centers developed in relatively isolation for tens of thousands of years. Only recently has modern technology made the planet feel smaller.

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