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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.
Although the specifics are a slightly different, in biology the same general idea applies. Since biology concerns life, producers and consumers are living things, or organisms. Producers make the food for the rest of us, and since we consume that food, we're called consumers. Let's look more closely at each of these types of organisms.