The optimum dissolved oxygen level (in mg/litre) required for survival of aquatic organisms is :

The optimum dissolved oxygen level (in mg/litre) required for survival

1.	The optimum dissolved oxygen level (in mg/litre) required for survival of aquatic organisms is :
A.	4 6
B.	2 4
C.	8 10
D.	12 16
Answer» B. 2 4

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The optimum dissolved oxygen level (in mg/litre) required for survival of aquatic organisms is :

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