why cannot we have more than three or four trophic levels in a food chain
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Energy is passed up a food chain or web from lower to higher trophic levels. ... This loss of energy explains why there are rarely more than four trophic levels in a food chain or web. Sometimes there may be a fifth trophic level, but usually there's not enough energy left to support any additional levels.
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Food chains are limited to 4 trophic levels because less and less energy is available at higher trophic levels.
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