Multiple Choice
Sewage sludge, the solid that remains after aerobic decomposition, makes a useful fertilizer because _______.
A) it contains significant energy in the form of methane
B) it is rich in carbon and nitrogen
C) it has been treated to remove microbes and will not be a source of pathogens
D) it is rich in nitrogen, phosphorus, and potassium
Correct Answer:
Verified
Correct Answer:
Verified
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