According to the Graph Below

question 78

Multiple Choice

According to the graph below:

• A)as you move away from the sewage spill, the demand for oxygen falls and then rises.
• B)the more raw sewage present, the less demand for oxygen.
• C)when the dissolved oxygen is less than 4 gm/liter of water fish cannot live and the dissolved oxygen will continue to fall.
• D)none of the above is true.

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