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There's a great deal of human diversity because we had a very tribal life for thousands of years, separating in little groups which all acquired slightly different genetic traits over time. A tribe that does not mingle with outsiders will eventually have a very homogenous look (just look at the primitive inhabitants of isolated island and you will notice how closely they resemble one another). Over the last couple of centuries, methods of transportation have made the world a much smaller place and we're all sharing the same living space, mingling with each other daily. If there's no movement for ethnic segregation, we will eventually become a single race with uniform, homogenous characteristic. This, of course, will require perhaps 500 generations or more. Just like the lion, the homo sapien will have a generic look.
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