Not all energy contained in a particular trophic level is in a usable form.
From the above statement, discuss what happens to undigestible plant and animal parts. Discuss the outcome of digestible plant and animal parts.
Determine that what is left over after energy usage for life activities, and lost as heat, can become biomass for an organism on a higher trophic level. The proportion of consumed energy than can be transferred is referred to as ecological efficiency.
Using a pyramid of biomass and indicating the efficiency at each level, determine the Kilocalories of energy which are transferrable from each level.
Discuss the energy harvest if all humans were vegetarians, compared to the amount needed to feed cattle in the same Hectare of land.