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Following curve represents 3 entities in a following river in which sludge was added.Curve X & Z represent (respectively)

$\begin{array}{1 1}(a)\;\text{ Sludge & Nitrogen } \\ (b)\;\text{Oxygen & Nitrogen} \\(c)\;\text{Oxygen & Microbes} \\(d)\;\text{Nitrogens & Microbes}\end{array}$

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