In an ecosystem, energy transfer between trophic levels typically follows the 10% rule, meaning that only about 10% of the energy from one level is passed on to the next. If grass has 25,000 KC AL of energy, then approximately 2,500 KC AL would be available to primary consumers (herbivores) at trophic level two. Following this pattern, about 250 KC AL would be available to secondary consumers (carnivores) at trophic level three, and around 25 KC AL would be stored at trophic level four (tertiary consumers).
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