The possibility human impact refered to in the statement is deforestation. Deforestation is the widespread removal of trees and other vegetation from forested areas for purposes such as agriculture, road construction and other infrastructural development.
Removing sections of forest can create a disconnect between areas of the forest preventing species from moving and otherwise confining them to smaller regions of the forest.
The jellyfish is the predator because it just caught the fish and is about to eat the fish. The fish is the prey because it was caught and about to be eaten.
C the only reasonable answer because if some amount of grass and fruit available were destroyed and they wouldn’t be as much of supply food for them so the some would have to migrate and some would die.
