In order to protect the aquatic creatures, the dissolved oxygen content in fresh water stream should never be less than __________ PPm.
Question: In order to protect the aquatic creatures, the dissolved oxygen content in fresh water stream should never be less than __________ PPm.
[A].
0.5
1
5
20
[A].
[B].
[C].
[D].
Answer: Option C
Explanation:
No answer description available for this question.