could one of these possible early human dispersals have occurred in the direction of Siberia, across the Bering Land Bridge, and down through North America, all the way to California? Or could another kind of human, like a Neanderthal, H. erectus, or Denisovan, have gotten to the Americas? Most archaeologists and geneticists are very skeptical of either possibility. From an archaeological perspective, no skeletal remains that look even remotely like an early human have been found in the Americas, and we have none dating from anywhere near that age. We also don’t see any unambiguous stone tools
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