Food Web
Food Chain
If a polar bear was taken out of a food web or foodchain.The whole system would be ruined because the polar bear is the primary source of the ecosystem.Without a polar bear the animal that eats it would end up dieing makeing all of the other animals that are suppose to be eaten by the polar bear. Like if the arctic cod was being eaten by all of the seal then the web/chain would be destroyed because all of the sources wouldnt have there meal to eat and eventually die out.