How do worms help plants grow?
A. They carry out chemical reactions that convert carbon dioxide to nitrogen.
B. They add excrement, a source of nutrients, plus they produce air space by crawling through the soil.
C. They are a source of minerals.
D. They decompose organic material into compounds plants can use.
Answer: B
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The number or variety of species found in a particular area is called
A. ecological diversity. B. species diversity. C. functional diversity. D. biodiversity. E. genetic diversity.
Which of these U.S. cities would be most affected by rising sea levels?
A. Miami B. Dallas C. Denver D. Atlanta
If the salinity of ocean water at the entrance to an estuary is 30 percent and the average salinity of the estuary is 20 percent, what fraction of the volume of water in the estuary is fresh water?
A. 1/2 B. 1/3 C. 1/4 D. 1/8 E. 16
Asking what effect stricter chlorofluorocarbon (CFC) controls in North America will have on the future size of the ozone hole over Antarctica is one example of analyzing a spatial interaction
a. True b. False Indicate whether the statement is true or false