Answer
Second law of thermodynamics deals with the energy lost in the system, in the form of heat, as energy is transformed from one form to another. The energy pyramid, which represents the trophic level or the position of an organism in a food chain follows this law, as only 10% of energy is passed from one organism to another.
For instance, a plant will use 90% of solar energy it harnesses for its own growth and reproduction. When it is eaten by a consumer, only 10% of its energy will go to the animal that eats it. That consumer will then use 90% of that energy and only 10% will go on to the animal that eats it. The same process occurs until the apex consumers.
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