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The shape of a pyramid is always wider at its base and narrower at the top. In a pyramid of biomass, the most biomass, or living organic matter in any ecosystem will be at the producer level. They provide the food for the levels that come later. Therefore, there will be more producers than anything else in a biomass pyramid. If this were in the ocean, the algae would be at the bottom of the pyramid and would represent the greatest amount of biomass. Next, would be the herbivores that feed on this algae. The next level, the carnivores, perhaps a fish, feeding on the crustaceans that are feeding on the algae. At the top of the pyramid of biomass, would be the largest consumers, perhaps sharks or large game fish. At each level, the pyramid of biomass decreases compared to the level beneath it.
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