❓ 题目 According to the passage, which of the following is a major criticism of the keystone species concept?
- A. It focuses too much on top-down control by predators.
- B. It fails to explain the role of mussels in intertidal zones.
- C. It is too broad and can be applied to many species, reducing its usefulness.
- D. It overemphasizes the importance of abundance over interaction strength.