Plants are capable of making their own food. All animals whether herbivores, carnivores or omnivores can not make their own food; hence, they depend on the plants for their food. Herbivores feed on plants to obtain nutrition. Again, the carnivores eat herbivores to obtain nutrition. Thus, carnivores indirectly depend on plants for their food. Omnivores, on the other hand, can directly obtain food from plants or indirectly consume animals which feed on plants. Thus, all animals ultimately depend on plants for their food.