question_answer

Eutrophication of a lake most likely is the result of

1. Elevated nitrogen gas level in water.

2. Elevated phosphorus levels in water.

3. Excessive concentration of\[C{{O}_{2}}\].

4. A decrease in oxygen content of the water.

Which of the above is/are correct?

A)  1 only             

B)  1 and 3

C)  1 and 2           

D)  1 and 4