Different consumers vary in how efficiently they convert food into biomass. Insects use , of the energy they absorb (that is, energy not lost in feces) to build biomass. The rest goes to maintenance....

Different consumers vary in how efficiently they convert food into biomass. Insects use
, of the energy they absorb (that is, energy not lost in feces) to build biomass. The rest goes to maintenance. Mammals and birds, on the other hand, use only
, of their absorbed energy to build biomass. They use much more energy for maintenance. What accounts for this difference?