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Food Chains A food chain is a representation of consecutive prey-predator relationships in a community. The first level within a food chain consists of the autotrophs, or organisms that produce their own food. The second trophic level is made of primary consumers, or herbivores. The third trophic level contains secondary consumers, carnivores or omnivores. In certain food chains, there could be additional trophic levels, with tertiary or higher consumers.
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