Concept:Only the pyramid of energy is always upright because energy flow in an ecosystem is unidirectional and decreases at each trophic level.Explanation:Pyramids of number and biomass can be inverted in some ecosystems (e.g., aquatic systems or parasitic food chains).Pyramid of energy shows the amount of energy transferred from one trophic level to the next.Energy always decreases as it moves up due to heat loss and metabolic use.This makes the pyramid of energy always upright.Pyramid of carbon is not a standard ecological pyramid.
