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# 2 main structural components of ecosystem

$\begin{array}{1 1}(a)\;\text{Species composition & stratification}\\(b)\;\text{Physiognomy & stratification}\\(c)\;\text{Abiotic content & species composition}\\(d)\;\text{Abiotic content & Physiognomy} \end{array}$

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2 main structural components of ecosystem are species composition & stratification
Hence (a) is the correct answer.
answered Mar 28, 2014