movement from one part of something to another
What will be an ideal response?
migration
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Which of the monomers below would be used to make the following polymer?
A. H2C 
CH2
B. HC CH-CH-C CH-CH3
C. HC CH-CH3
D. H2C-CH2-CH3
E. none of the above
The threshold level for harmful effects of toxic pollutants is most closely related to the
A) first appearance of chronic effects. B) time of day of exposure. C) concentration of exposure. D) concentration and duration of exposure.
Photovoltaic cells are a component part of
A) nuclear power plants. B) geothermal energy generation. C) active solar energy systems. D) wind turbines. E) biomass collection.
How much of the nation's land is under the control of the federal agencies?
A. less than 5% B. about 10% C. about one-quarter D. about one-third E. nearly half