Quote:
Originally Posted by woot
Because why have only one air-tight theory when you can have two?
But seriously, knowing one method of migration doesn't eliminate the possibility of others.
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When tooblue was saying the land bridge theory wasn't air-tight, I think he was referring to the perception of some that it was the ONLY means of trans-continental migration and ergo the only source of genetic contributors to the Native American population.
Genetic research of ancient North American human remains has shown the remains to be much more heterogeneous than originally thought.