What does a food chain represent?

Food chain represents the flow of food energy in a chain from the primary producers to the consumers through different successive levels of consumers. The lowest trophic level is represented by the producers which are usually green plants and the last one by the decomposers.

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A food chain represents a series of events in which food and energy are transferred from one organism in an ecosystem to another. Food chains show how energy is passed from the sun to producers, from producers to consumers, and from consumers to decomposers.
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