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So they couldn’t give you evidence, just assumptions?

• Retric 9y ago
  Their is plenty of evidence for population drift. Why did native Americans have a different skin coloration than the rest of the world? Remember, the land bridge was recent and humans with a long reproductive cycle still had very noticeable drift over ~1,000 generations. Which was not simply adaptation like reducing pigmentation when moving North. Genetic incompatibility is actually rather difficult to understand in detail as in what specifically stops working and why that occurred, but easy to understand at a high level.