When wolves in the Yellowstone area in Wyoming were eliminated, the population of elk exploded and the coyote willow shrubs were overgrazed. Which type of species did the wolf represent in this ecosystem?
A. keystone
B. indicator
C. invasive
D. nonnative
Answer: A
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Which of the following processes is involved with the heat of fusion?
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Typically, popular culture
A) originates in a number of locations at the same time. B) reflects the characteristics of a distinctive physical environment. C) experiences frequent changes through time and space. D) is practiced by small homogeneous groups. E) is practiced by small heterogeneous groups that become large homogeneous groups.