____ is a measure of the quantity of oxygen used by biological organis – McqOptions

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1.	____ is a measure of the quantity of oxygen used by biological organisms to break down organic material present in a given water sample.
A.	Oxygen requirement
B.	Potable water
C.	Biochemical oxygen demand
D.	Physical oxygen demand
E.	Non e of these
Answer» D. Physical oxygen demand

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