❓ 题目 According to the passage, what is the main reason Robert Paine's experiment with Pisaster ochraceus is considered significant?
- A. It proved that all predators are keystone species.
- B. It demonstrated that removing a single predator can lead to a decline in biodiversity.
- C. It showed that mussels are more adaptable than other intertidal species.
- D. It was the first experiment to study intertidal zones on the Pacific coast.