Which of these belong to a trophic level with the least energy?

Deer

Grass

Mountain lion

Rabbit

mountain lion

Explanation:

Of the chemical energy formed in plants, only a small fraction is transferred to the next trophic levels of an ecosystem. The mountain lion being the tertiary receives least amount of energy because part of the energy is used up the organisms for cell respiration, not all the stored food energy is assimilated by the consumers and some energy is stored in the environment for long periods in form of bones.