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The document defines key terms in a food chain including producer, consumer, decomposer, herbivore, carnivore, omnivore, predator, and prey. Producers are living things that make their own food, consumers eat other living things, and decomposers eat dead plants or animals. Herbivores only eat plants, carnivores only eat meat, and omnivores eat both plants and meat. Predators naturally prey on other animals, while prey are animals that are hunted for food by other animals.