Question

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Biological Factors Quick Check
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Question
Which food source’s scarcity caused the Yellowstone National Park beaver population to decrease?(1 point)
Responses

otter
otter

willow
willow

fish
fish

grass
grass
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Answer 1

The food source's scarcity that caused the Yellowstone National Park beaver population to decrease is **willow**. Beavers primarily rely on the bark and twigs of willow trees as a food source, so a decrease in willow availability would directly impact their population.