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Consumers or heterotrophs are organisms that obtain organic molecules by eating or digesting other organisms. These are the herbivores and carnivores of the ecosystem. By eating other organisms they gain both food as an energy supply and nutrient molecules from within the biomass ingested.
Confidence votes 17. The base is producers, who create their own food. The first level consumers are next, who gain food from producers. Next are the second level consumers, who consume the first level consumers to get the energy the first level consumers possessed. At the top are third level consumers, who gain energy from everything below it on the pyramid.