<P> For example, assume 500 units of energy are produced by trophic level 1 . One half of that is lost to non-predatory death, while the other half (250 units) is ingested by trophic level 2 . One half of the amount ingested is expelled through defecation, leaving the other half (125 units) to be assimilated by the organism . Finally one half of the remaining energy is lost through respiration while the rest (63 units) is used for growth and reproduction . This energy expended for growth and reproduction constitutes to the net production of trophic level 1, which is equal to 500 ∗ 1 / 2 ∗ 1 / 2 ∗ 1 / 2 = 63 (\ displaystyle 500 * 1 / 2 * 1 / 2 * 1 / 2 = 63) units . </P> <P> Ecological efficiency is a combination of several related efficiencies that describe resource utilization and the extent to which resources are converted into biomass . </P> <Ul> <Li> Exploitation efficiency is the amount of food ingested divided by the amount of prey production (I n / P n − 1 (\ displaystyle I_ (n) / P_ (n - 1))) </Li> <Li> Assimilation efficiency is the amount of assimilation divided by the amount of food ingestion (A n / I n (\ displaystyle A_ (n) / I_ (n))) </Li> <Li> Net Production efficiency is the amount of consumer production divided by the amount of assimilation (P n / A n (\ displaystyle P_ (n) / A_ (n))) </Li> <Li> Gross Production efficiency is the assimilation efficiency multiplied by the net production efficiency, which is equivalent to the amount of consumer production divided by amount of ingestion (P n / I n (\ displaystyle P_ (n) / I_ (n))) </Li> <Li> Ecological efficiency is the exploitation efficiency multiplied by the assimilation efficiency multiplied by the net production efficiency, which is equivalent to the amount of consumer production divided by the amount of prey production (P n / P n − 1 (\ displaystyle P_ (n) / P_ (n - 1))) </Li> </Ul> <Li> Exploitation efficiency is the amount of food ingested divided by the amount of prey production (I n / P n − 1 (\ displaystyle I_ (n) / P_ (n - 1))) </Li>

What is ten percent law explain with an example