What rule obeys the change in the energy flow rate along the food chain?

Energy losses during the transition from one trophic level to another (higher) determine the number of these levels and the ratio of the number of predators and preys. It is estimated that only about 10% (or slightly more) of the energy of the previous level enters any trophic level. Therefore, the total number of trophic levels rarely exceeds three or four.

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