What is the essence of the rule of the ecological pyramid?

Rule of the Ecological Pyramid: transfer of energy from one trophic level to another with a decrease in energy by 10%.
There are a pyramid of numbers, reflecting the number of individuals in each link of the food chain, a biomass pyramid – the amount of organic matter synthesized at each level, an energy pyramid – the amount of energy in food. All of them have the same orientation, differing in the absolute value of digital values.

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