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The number of trophic levels in an ecosy...

The number of trophic levels in an ecosystem are limited. Comment. 

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Because the amount of energy available goes on decreasing from lower trophic level to higher trophic level . The loss of energy occurs according to 10% law proposed by Lindemann. So after certain steps of transfer of energy, a stage comes when the energy available is too less to sustain the trophic level.
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