Which of the following terms refers to clouds that appear as bag-like sacks hanging from beneath other clouds?
A. pileus
B. mammatus
C. castellanus
D. lenticular
Answer: B
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The current urbanization experience of many developing countries is similar to the United States' ________ that occurred in the nineteenth and early twentieth centuries.
A. Rural-to-urban shift B. Demographic transformation C. Demographic transition D. Urban-to-rural shift E. Demographic rural shift
Figure 3.15 Generalized pyramid of energy flow showing the decrease in usable chemical energy available at each succeeding trophic level in a food chain or food web.
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Use the accompanying figure to answer the following five questions.
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Letter D, at the base of the pyramid given above, represents what group of organisms?
What will be an ideal response?
In Costa Rica, cutting down forests will almost immediately increase the cost of producing __________.
a. timber for building homes and factories b. fresh water c. wood pulp for the many paper factories in the region d. all of the listed choices
This pyramid shows the ratio of organisms, energy content, and biomass at different trophic levels. Suppose that a system has 5000 grasshoppers. How many hawks would be expected?
a. 5 b. 50 c. 500 d. 5000