Why length of food chain in an ecosystem is generally limited to three

1.	Why length of food chain in an ecosystem is generally limited to three or four trophic levels ?
Answer» Due to decrease in energy at each trophic levels the length of food chain is less. The length of food chani in an ecosystem is only about 3-4 trophic leveles because of the 10% law . According to 10% law when we go through trophic levels the energy gets decreased in every trophic level

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