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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.
The difference between producers and consumers in an ecosystem is  the way that they obtain food. Producers can make their own food,  consumers do not.1 person found this useful. Edit.hese are the herbivores (animals that eat only plants), the carnivore (animals which only eat meat), and the omnivores (animals that eat both plants and animals). A decomposer is an organism that breaks down waste and dead organisms into nutrients for the producers. These can be fungi, animals, bacteria, etc...