Read: 'Wolves were once hunted to near extinction in Yellowstone National Park. After their reintroduction in 1995, vegetation grew back along riverbanks, and several other animal populations recovered.' What does this passage suggest?
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A
Wolves are the most important animal in North America
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B
Removing a top predator can disrupt an entire ecosystem
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C
Hunting should be banned in all national parks
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D
Rivers flow faster when there are more wolves nearby