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An eco system must have a continuous external source of

$\begin{array}{1 1}(a)\;\text{Minerals}\\(b)\;\text{Energy}\\(c)\;\text{Food}\\(d)\;\text{All of these}\end{array} $

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An eco system must have a continuous external source of energy.
Hence (b) is the correct option.
answered Mar 27, 2014 by sreemathi.v
 
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