The answers is fossil fuels.
The ocean is least likely because it is salt water not fresh water, as opposed to lakes :)
That would be the Endoplasmic Reticulum my good friend hope this helped... :D
Answer:The fox population would drop a bit.
Explanation:
Some of the foxes would keep going on with life because they didn't eat that rodent much, others would starve because it was there main source of food.