The correct option is D Flesh of other animals
In a forest ecosystem, carnivores are predators that have sharp teeth to rip the flesh of the prey. They also have powerful jaws to bring down the prey. Carnivores such as lions and tigers are secondary consumers which belong to the third tropical level in a food chain. They feed on herbivores such as deer which are primary consumers and belong to the second trophic level. Thus the correct answer is option D.