Here's why:
* Pyramid of Biomass: This pyramid represents the total amount of living organic matter at each trophic level. It is directly related to the amount of matter (in the form of organic compounds) that is present at each level. Since matter is recycled within an ecosystem, the pyramid of biomass shows how much matter is being accumulated and transferred from one level to the next.
While the pyramid of energy accurately portrays the flow of energy, it doesn't directly show the movement of matter. Matter is not lost in an ecosystem like energy is, and instead, it is cycled through different trophic levels.
Let me know if you'd like more details about any of these pyramids!