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Question
After the number of wolves declined in Yellowstone National Park, ____.
a. the ecosystem recovered and became more stable
b. herds of elk, moose, and mule deer devastated willow and aspen trees near streams and rivers
c. the elk population crashed
d. forest fires decreased in frequency because the larger mule deer population controlled undergrowth
e. coyotes took over their role in the ecosystem, leading to few changes
Answer
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