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1. unidirectional
2. it losses 10% energy in every trophic level
3. flow of solar energy.

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1)it helps in understanding the food relationship and interactions among various organisms...
2)it helps in following the basic mechanism of transfer of food energyand nutriets through various components of nature.
3)it helps to understnad the movement of toxic substances in an ecosystemand problem of their bological magnification.
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