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Which is the best fertilizer?

$\begin{array}{1 1}(A)\;\text{Synthetic fertilizer}\\(B)\;\text{Bacillus thuringiensis and lichen}\\(C)\;\text{Azolla and cyanobacteria}\\(D)\;\text{All the above}\end{array} $

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Azolla and cyanobacteria
Hence (C) is the correct answer.
answered Jul 16, 2014 by sreemathi.v

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