Different consumers vary in how efficiently they convert food into biomass. Insects use 10,940, of the energy

Question:

Different consumers vary in how efficiently they convert food into biomass. Insects use 10,940, 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 1,93, of their absorbed energy to build biomass. They use much more energy for maintenance. What accounts for this difference?

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