Environmental stress encountered at high altitudes includes:
A. low partial pressure of oxygen
B. cold temperature
C. high levels of solar radiation
D. all of these
D. all of these
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Though pastoral nomadic peoples are often blamed for causing environmental degradation, the fault is often not theirs. Rather, in areas such as sub-Saharan Africa it is caused by:
a. unrestricted development. b. a tremendous increase in tourism. c. the ever-burgeoning use of off road vehicles. d. governments that restrict their movements causing overgrazing. e. global warming.
Approximately how many young people does China have in its migrant labor force today?
a. 53 million b. 71 million c. 114 million d. 213 million
Comparisons of 100 primate genes indicate that humans and chimpanzees last shared a common ancestor about ______ years ago
a. 6-7 million b. 50-60 million c. 4.6 billion d. 2-3 million e. 20-30 thousand
Which of the following is not a characteristic of Great Apes?
a. narrow nose and palate b. Y-5 molars c. larger average body size d. shorter torso e. longer arms