Ecologist Dr. James Park argues apex predators maintain ecosystem health through trophic cascades—effects rippling down food chains.
10
readingWhich study would best support Park's cascade argument?
A
Wolves are social animals
B
Ecosystems contain many species
C
Predators hunt prey
D
After wolf reintroduction in Yellowstone, elk behavior changed, willows recovered, streams stabilized, beaver populations grew, fish habitats improved, and bird diversity increased
Correct Answer: D
Choice D is the best answer. Six-level cascade documented proves multi-trophic effects.
💡 Strategy: Cascade claims need evidence of linked effects across multiple levels.