❓ 题目 According to paragraph 3, what is one criticism of the keystone species concept mentioned in the passage?
- A. It overemphasizes the role of physical factors in community structure.
- B. It is often applied too broadly, without strict criteria for disproportionate effects.
- C. It fails to account for the importance of competition among similar species.
- D. It relies solely on experiments with starfish, limiting its generalizability.