One is that the earliest immigrants to the Americas came from Europe, perhaps by walking from Norway to Newfoundland on the North Atlantic, which was frozen solid 16,000 years ago. Evidence for this theory comes from the Clovis spearpoints made in North America 11,000 years ago, which more closely resemble the stone tools of Europe than Asia. Another possible explanation, supported by more recent studies, is that 9000 years ago, all Eurasians had some Caucasoid features. Recent examinations of a cast of Kennewick Man's skull point toward Ainu or Polynesian, rather than European, features. A role for DNA testing DNA testing may be able to shed light on the paths of immigration to the Americas.
Human hair can survive for thousands of years.
If one goes back far enough in prehistory, both views about ancestry are correct, because all of us are related. People with Kennewick Man's features could have come from both East and West. In the future, DNA tests may provide more clues. Expert Panel Recasts Origin of Fossil Man in Northwest. The Lost Man.