❓ คำถาม According to the passage, what is a key implication of hysteresis in lake ecosystems?
- A. A) Restoring a clear-water state requires less nutrient reduction than the amount that caused the shift to turbidity.
- B. B) Reversing a shift to a turbid state is relatively easy if nutrient levels are reduced slightly.
- C. C) The amount of nutrient reduction needed to restore clear water is often greater than the amount that triggered the turbid state.
- D. D) Lakes can always return to their original state if given enough time after nutrient inputs cease.