Increased biological oxygen demand is an indication of1. Low microbial – McqOptions

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1.	Increased biological oxygen demand is an indication of1. Low microbial contamination.2. Absence of microbial pollution.3. High level of microbial contamination.Which of the above statements is/are correct?
A.	1 only
B.	2 only
C.	3 only
D.	1, 2 and 3
Answer» D. 1, 2 and 3

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