Answer to Question #234447 in Human geography for uran

Question

why do food chains rarely get longer than four or five levels?

Answer 1

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.