At first, the population of predators would spike and increase quickly, but then over time, gradually decrease.
(This is because at first there's more food, so the predators population increases. But overtime it begins to level out and the predators' population catches up with the prey, and in result, doesn't continue increasing.)
That’s very simple uranium I believe but I haven’t done science class in like 7 years so don’t quote if I’m wrong
The density of the water causes pressure, which causes water to move.