❓ 题目 According to the passage, which of the following statements about keystone species is true?
- A. A) Keystone species are always top predators that control prey populations.
- B. B) The influence of a keystone species is directly proportional to its abundance in the ecosystem.
- C. C) The removal of a keystone species can lead to a significant decline in biodiversity.
- D. D) Identifying keystone species is easy because their effects are consistent across all habitats.