As the food chain contains and there are also carnivores who feed on the herbivores and then other carnivores which eat those carnivores the energy is passed on from trophic level to trophic level and each time some of the energy is lost.
As the food chain contains and there are also carnivores some of the energy is lost. These carnivores feed on the herbivores. These carnivores feed on then other carnivores. These then other carnivores eat those carnivores. The energy is passed on from trophic level to trophic level. The energy is passed on from each time those carnivores.