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Origins of Native Americans debated: views differ on what DNA says about ancestral populations.
A previously hidden genetic link between native peoples in Australia and the Amazon has inspired two different research teams to reach competing conclusions about the origins of Native Americans.
One team analyzing modern genetic data finds evidence that at least two ancestral populations gave rise to Native Americans. Another team, analyzing DNA from present-day and ancient Americans, reports that Native Americans came from a single ancestral population.
Both teams agree that...
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