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This is my comment for Ereni. It won't let me post a comment on her muddiest point.

Pyramids of biomass show the amount of living organic matter at each level in an ecosystem. (Biomass is the total amount of living things in a trophic level)
The primary producers tend to have more mass.
As you go up the pyramid, the numbers decrease.
A pyramid of numbers shows the number of individual organisms at each level in an ecosystem.

Hope this helps!
-Kaitlyn