Hypoxia:
A.is due to insufficient amounts of vitamin D
B.occurs at higher altitude because the atmosphere contains less oxygen than at sea
level
C.exerts no stress on humans
D.is a problem for people living at sea level
E.none of these
Which of the following presents the primary challenge that the Bering Land Bridge
represented the first route for the first humans in the New World?
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.all of these