What is understood by environmental pyramids? What species distinguish them?

This is a way to graphically display the ratio of various trophic levels in an ecosystem.
There can be three types:
* pyramid of numbers – reflects the number of organisms at each trophic level;
* Biomass pyramid – reflects the biomass of each trophic level;
* energy pyramid – shows the amount of energy that has passed through each trophic level for a certain period of time.

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