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Which food sources scarcity caused the Yellowtone National Park beaver population to decrease?

A. Willow

B. Fish

C. Otter

D. Grass

1 answer

A. Willow

The scarcity of willow, which is a crucial food source for beavers, has contributed to the decrease in the beaver population in Yellowstone National Park. Beavers rely on willow for food and for building their dams.