The answer is: Carnivores
Organisms at the third trophic level are secondary consumers. These secondary consumers prey on the primary consumers which are animals that eat plants or herbivores. Secondary consumers are best described as carnivores because they don't eat plants. They only eat animals that consume plants like cows and chicken.
Kinesics is the study of body motions as a form of communication.
D) Amphibia was considered to be the first to develop lungs
I think the skin is the largest organ in the human body :)
I hope this helps!