A) Nutrient deficiency.
B) Oxygen deficiency.
C) Excessive nutrient availability.
D) Absence of herbivores in the lake.
Correct Answer: B
Solution :
[b] In polluted water nitrogen and phosphorus (from sewage) are accumulated, which results in excessive growth of algae on water surface. Excessive growth of algae called water bloom. Due to death and decomposition of organic matter, \[{{O}_{2}}\]is not-available to aquatic animals.
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