Good health in the modern world, with few cases of bacterial infection, is largely the result of
A) the development and widespread use of new immunizations.
B) clean water supplies and proper treatment of sewage.
C) widespread use of bleach, antibiotics, and antibacterial soaps.
D) frequent bathing and washing of clothing and dishes.
B
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The highest amounts of pesticides or their breakdown products would be found within a cougar in its
A) saliva. B) muscles. C) kidneys. D) body fat.
Why might logging of a drainage basin change the slope of the river?
A) The base level of the stream is altered by the increased sediment load. B) The stream must steepen to accommodate the increased runoff. C) Increased sediment load causes the river to steepen its gradient to transport more sediment. D) Decreased erosion shuts off sediment supply, causing the river to erode.
Which of the following is an inflow to an urban ecosystem?
A) solid waste B) polluted water C) polluted air D) heat E) natural resources
The "filtering model" of housing markets is based on what principle?
A) Housing quality rises and falls in regular cycles. B) Zoning ordinances evens out differences in housing quality. C) Gentrification evens out differences in housing quality. D) There is an increase in the quality of a house over time. E) There is a decrease in quality of a house over time.