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Trophic levels refer to the hierarchical positions occupied by organisms in a food chain or food web based on their feeding relationships and source of energy. Each trophic level represents a step in the transfer of energy and matter within an ecosystem. The first trophic level consists of producers or autotrophs such as green plants, algae, and phytoplankton, which synthesize organic food using solar energy through photosynthesis. The second trophic level is made up of primary consumers or herbivores that feed directly on producers. The third trophic level includes secondary consumers, generally carnivores that feed on herbivores. Higher trophic levels may include tertiary and ____ _________ ______ _________ _______ ____.
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