WVGSA Grade 8 Science Practice Questions - West Virginia General Summative Assessment Grade 8 Science Exam

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When gray wolves (apex predators) were reintroduced to Yellowstone National Park, elk changed their grazing habits away from riverbanks. Consequently, willow trees regrew, beaver populations surged, and river erosion decreased. What ecological phenomenon does this food web study demonstrate?

A trophic cascade, where top predators exert indirect control on ecosystem structure and physical habitat Competitive exclusion, where wolves competed directly with beavers for willow bark Primary succession on newly formed volcanic rock Mutualism between wolves and elk

Correct Answer:

A trophic cascade, where top predators exert indirect control on ecosystem structure and physical habitat

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