Plasmolysis is the reason. The reason that the Elodea cell prevents from collapsing completely is that the Plasmolysis is the main reason because it always has water to keep it full. The answer in this question is Plasmolysis is the reason because it always has water to keep it full.
There would be more prey than predators, as for a predator to have a balanced diet it should have a plentiful supply of food, meaning it needs more prey. You're welcome!
