A food chain is a linear network of links in a food web starting from producer organisms and ending at an apex predator species, detritivores, or decomposer species. A food chain also shows how organisms are related to each other by the food they eat. Each level of a food chain represents a different trophic level.
A food web is the natural interconnection of food chains and a graphical representation of what-eats-what in an ecological community. ... The food web is a simplified illustration of the various methods of feeding that links an ecosystem into a unified system of exchange.
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