Natural levees are constructed of machine-compacted sand and mud; artificial levees are made of concrete.
a. true
b. false
Ans: b. false
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The European wild boar is considered an invasive species because it
A. competes for food with native endangered species. B. causes traffic accidents. C. provides game. D. controls pest populations of the Argentina fire ant. E. is a variety of the feral pig.
The average number of children born to women in a population during their reproductive years is the
a. crude birth rate b. total birth rate c. total fertility rate d. crude fertility rate e. population's natural rate of increase
Crude birth rates rise in Stage Three of the demographic transition as a result of economic growth, urbanization, rising standards of living, and education
Indicate whether the statement is true or false.
One widely used method for desalinating water is ____.
A. activated carbon filtration B. subsidence C. transpiration D. reverse osmosis E. treadle pumping