Some toxic chemicals, such as those in DDT, can be stored in the fat tissue of animals. As these animals become food for larger and larger animals, the amount of the toxin gets larger and larger. What is this process called?
A. biophilia
B. biosphere
C. biotechnology
D. biomagnification
E. concentration index
Answer: D
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According to the primate city rule, the largest settlement has
A) about the same size as the second ranking settlement. B) slightly more people than the second ranking settlement. C) more than twice as many people as the second ranking settlement. D) about three times the population of the second ranking settlement. E) about four times the population of the second ranking settlement.
Winters are generally mild in which climate?
a. highland b. ice-sheet c. subarctic d. humid continental, hot summer
The lowest level of the atmosphere is called the ___________ and is responsible for the conditions that allow life to exist on the planet's surface.
-troposphere -thermosphere -ionosphere -stratosphere -exosphere
An example of a rock type that could be a good aquifer is:
a. shale. b. quartz sandstone. c. clay. d. basalt. e. marble