If herbivore numbers decline in a forest and carnivores begin to weaken, what relationship does this show?

Correct answer: Interdependence of the food chain

Direct answer: Option A, interdependence of the food chain. A food chain shows how energy and food pass from producers to herbivores and then to carnivores. Plants are eaten by herbivores, and herbivores may be eaten by carnivores. If herbivore numbers decline, carnivores lose an important food source. They may become weak, reproduce less, migrate, or die if replacement food is unavailable. This step-by-step effect demonstrates that organisms at different levels depend on one another and that a change at one level can affect others. Option A expresses this relationship. Option B is too narrow: weather may affect wildlife, but the described herbivore–carnivore link directly shows food-chain dependence. Option C, soil colour, does not explain the weakening carnivores. Option D is false because wildlife survival is closely related to habitat, food, water, and shelter. Memory cue: change one food-chain link and connected links respond.