Because the animal feels guilty of taking energy from the environment and not giving anything in return, therefore it looses some biomass as faeces.
Because the biomass an animal eats is excessive to what the animal really needs, therefore the biomass that the animal doesn't need is excreted as faeces.
Because not all of the biomass an animal eats as energy can be used, therefore the remaining biomass that hasn't been digested is lost in faeces.
Because the animal has an instinct to excrete, and therefore biomass is often lost in faeces.
9. What is this: fossil fuel or wood + oxygen ➡️ Carbon dioxide + water
Combustion
Pollution
Photosynthesis
Respiration
10. "The mass of living material at each stage of a food chain is less than at the previous stage." True or False?
