❓ 题目 According to the passage, which of the following is a main criticism of the keystone species concept?
- A. A) It focuses too much on top-down control and ignores bottom-up forces.
- B. B) It has no practical applications in conservation biology.
- C. C) Its application is often subjective and depends heavily on the specific ecological context.
- D. D) It overemphasizes the abundance of a species rather than its impact.