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In an ecosystem which one shows one way passage

$\begin{array}{1 1}(a)\;\text{Nitrogen} \\ (b)\;\text{Carbon} \\(c)\;\text{Pottassium} \\(d)\;\text{Free energy}\end{array}$

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Minerals are cycled,energy flow is unidirectional.
Hence (d) is the correct answer.
answered Mar 24, 2014 by sreemathi.v
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