Based on the types of crops cultivated in Africa today, researchers believe that __________
A. all domesticated plants were brought by populations migrating from Southeast Asia
B. there must have been several centers of independent domestication
C. ancient agriculture was restricted to the Nile Valley, which could be relied upon for annual floods
D. sub-Saharan Africa was the source of drought-resistant varieties of maize and wheat
Answer: B
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Presently 60% of all deaths in America are caused by __________
a. infectious diseases b. diseases of old age c. accidents d. crime-related injuries
What are the two ways in which archaeologists collect information in the field? What kinds of information does each technique collect? What are the limitations of each technique?
What will be an ideal response?
Darwin argued that the large physical size of males was a physical specialization to aid in competition between males for females. He called this theory:
a. sexual selection. b. natural selection. c. hybrid selection. d. reproductive selection. e. intra-species competitive selection.
Why do Taiwanese sim-pua marriages not do as well as other marriages in Taiwan?
a. Laws prohibit the practice. b. The couple was raised together as children. c. The married couple are too different in age. d. The married couple is a biological incestuous pair of some kind.