What is the typical/average percentage of loss of energy in transfers from one trophic level to the next?

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The typical or average percentage of loss of energy in transfers from one trophic level to the next is approximately 10%. This means that only about 10% of the energy from one trophic level is transferred to the next level, while the remaining 90% is lost in the form of heat or is used for metabolic processes. This is known as the 10% rule and it is a fundamental concept in ecological energetics.