The flow of energy moves through the layers of the energy pyramid from the bottom-up, and is gradually reduced as energy is used up by the organisms at each level. The base of the energy pyramid indicates the energy available within primary producers.What are the trophic levels?
Trophic levels are the feeding positions of all organisms in a specific ecosystem. You can think of them as food chain levels or as a trophic level pyramid. The first trophic level, or base, of an ecosystem has the highest energy concentration.