The reintroduction of wolves into the Yellowstone ecosystem has been considered a success because
A. the wolves are thriving.
B. local ranchers fear that wolves will attach cattle.
C. ecotourism has decreased.
D. biodiversity of the ecosystem has been re-established and sustained.
E. global warming has ceased.
Answer: D
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Volcanic eruptions can trigger lahars that may occur long after the volcanic activity has ceased. The simplest definition of a lahar is?
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The Mississippi River delta is what kind of delta?
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