A) the age estimates for the earliest humans in North and South America
B) close geographic proximity of northeastern Asia and northwestern North America
C) presence of the Beringia 'land bridge; during the late Pleistocene
D) the documented Pleistocene migration of animals along this route
E) the linguistic and genetic similarities of Asian and Native American populations

A) the earliest occupations pre-date the presence of Beringia
B) many early occupations pre-date the presence of the Ice Free Corridor
C) there are no Upper Paleolithic sites in northern Asia at the time of first settlement
D) modern Native Americans are genetically unrelated to northern Asian populations
E) the technologically simplest way to enter is not on foot

A) the colonization of Australia by 40,000 ya.
B) the presence of early coastal sites in South America
C) the demonstrated presence of marine-adapted human populations in northeastern Asia
D) the relative lack of interior sites in North America
E) the technological capabilities of Late Pleistocene populations