Neandertals can be found in __________
a. western Europe
b. northern Africa
c. southern Africa
d. Australia
Correct Answer: a
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Cities first appeared in the Near East about
a. 5500 B.C. b. 4500 B.C. c. 3500 B.C. d. 2000 A.D.
One critical economic difference between a firm and a household is:
a. Firms look for profit in their cash transactions, households rarely do. b. Firms have no obligations to the communities in which they are found; households have many. c. Firms may grow with relative ease, but the structure of households limits their growth. d. Firms may expand their size through hiring new members but the membership of a household is fixed. e. Firms usually behave in a manner that is economically rational, households rarely do.
Melanocytes
a. are cells that produce carotene. b. cause skin cancer. c. only occur in dark-skinned individuals. d. absorb ultraviolet radiation. e. produce melanin.
Rickets is caused by
a. overexposure to ultraviolet radiation. b. too much vitamin D. c. an insufficient amount of melanin. d. too few melanocytes. e. insufficient amount of vitamin D.