Which of the following statements is incorrect? (A) Primary sludge does not have flocs of decomp...

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Which of the following statements is incorrect?
(A) Primary sludge does not have flocs of decomposer microbes.
(B) Biogas generation involves aerobic digestion of organic wastes.
(C) Bioherbicides are used for inhibiting the growth of weeds.
(D) Second stage of biogas formation is the formation of organic acids from monomers.
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