The diagram shows an energy pyramid for a field ecosystem.

Question

Why does available energy decrease toward the top of the pyramid?
A. More plants exist than can be eaten by herbivores.
B. Humans use most of the energy available in the ecosystem.
C. Organisms in each trophic level lose heat to the environment.
D. Animals in higher trophic levels are more likely to catch diseases.

Answer 1

C. Organisms in each trophic level lose heat to the environment.