❓ 题目 According to the passage, which of the following statements best explains why a lake that has shifted to a turbid state may not easily return to clear water?
- A. A) The disturbance that caused the shift is still present and continues to affect the lake.
- B. B) Feedback mechanisms stabilize the new turbid state, creating hysteresis.
- C. C) Functional diversity is reduced, eliminating species that could restore clarity.
- D. D) The lake lacks the resilience to absorb any further nutrient inputs.