I read somewhere that DNA studies are unsettling the old anthropology guard that based theories by the study of skulls or teeth, etc,
I read somewhere that skeletal features can be plastic to a degree. I.e. that people with certain skeletal features and presuambly other physical features, can morph over time depending on the climate.
This was used to explain the decidedly un-Indian appearance of Kennewic (spelling?) man, although in in that case, I think the jury is still out about European and African migrants reaching the Americas along with Asian immigrants.
North American Native Americans look more “Asian” and even, in some cases, more “European” while some South American Native Americans look slightly African.
The mtDNA cheerleaders overstate their claims, at best. :’)