Which of the following statements about shifting cultivation is true?
A. It typically involves the use of draft animals.
B. It cannot support permanent villages.
C. It requires irrigation.
D. It requires cultivators to let exhausted plots of land lie fallow for several years.
E. It relies extensively on chemical fertilizers
D. It requires cultivators to let exhausted plots of land lie fallow for several years.
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Nonhuman vocal systems are often referred to as __________ systems, because they do not combine different calls to produce new meanings
A) closed B) absolute C) limited D) restricted
At birth, an infant can distinguish __________
A) between all the sounds of all the languages in the world B) between all the sounds used in his or her parents' language C) only the difference between male and female vocal registers D) the sounds made only by his or her mother's voice
Thomas Malthus
a. proposed that population size is kept in check by the limited availability of resources. b. wrote the theory of catastrophism. c. wrote the theory of uniformitarianism. d. had no influence on the development of Darwin's and Wallace's theories of natural selection. e. was a sixteenth-century mathematician.
Which of the following statements best describe the Yarahmadzai subsistence strategy?
A) They herd camels, cattle, goats, and sheep, and they depend on the global market for trade. B) They herd only camels and live exclusively on camel products. C) They herd cattle and camels, but their primary source of food is wheat. D) They herd various types of animals, but also sell and exchange milk products for grain. E) They herd various types of animals, but their main source of protein is camel meat.