❓ 문제 According to paragraph 2, which of the following best describes the author's attitude toward the keystone species concept?
- A. A. It is scientifically flawed and should be discarded from ecological research.
- B. B. It is a simple and universally applicable rule for ecosystem management.
- C. C. It is a useful but imperfect tool that requires careful application.
- D. D. It has been fully validated by experimental evidence in all habitats.