Which of the following is true regarding fuel cell technology?
A. They are only about 40-45% efficient.
B. They must receive a constant supply of water and oxygen.
C. They must be recharged with an electrical current.
D. They were first designed by NASA.
E. A fuel cell stack providing all of the electricity for a typical home is not feasible because it would be too large.
Answer: A
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Which occurs when the innovation is carried to new areas by migrating individuals?
A. expansion diffusion B. relocation diffusion C. hierarchical diffusion D. contagious diffusion
The world leader in land area devoted to organic farming is
A) Australia. B) the United States. C) Canada. D) France. E) Japan.
Where on this cross section would water at the surface become groundwater?
A. 4 only B. 2 only C. 2 and 4 D. 1, 2, and 3 E. 1 and 3
Pastoral nomads and many animals migrate to mitigate the effects of drought, a coping adaptation known as drought avoidance
a. True b. False Indicate whether the statement is true or false