If all vegetation in the pond died what effect would it have on the animals? and why

It will have a big affect on the animals because then the herbivores won't have anything to eat, then all of the herbivores will die. Then the carnivores, which eat the herbivores will die also because they do not have anything to eat. So without the vegetation, all of the animals near the pond, will die.

If there was no gravity then their would be no downword force on the football to have it return the the grownd, and if there was no friction (mainly air friction) then there would be no opposing force the stop the ball from moving through the air allowing the ball to travle ∞.