❓ 質問 According to the passage, which of the following best describes the primary finding of Robert Paine's experiments?
- A. Physical factors are the main determinants of community structure in intertidal zones.
- B. The removal of a top predator can reduce species diversity by allowing a dominant competitor to take over.
- C. Competition among species at the same trophic level is the most significant force shaping ecosystems.
- D. Herbivores and mutualists are more important than predators in maintaining ecosystem balance.