Question

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which of the following is not a consequence of the runoff of fertilizers into the water supply?
the oxygen levels in water increase.
tainted drinking water leads to human disease.
fish die because of toxins.
algal blooms take over a body of water.

Explanation:

Fertilizer runoff causes eutrophication. Algal blooms occur which consume oxygen during decomposition, decreasing oxygen levels in water. Tainted water can cause human disease, toxins can kill fish, and algal blooms can over - take water bodies. But it does not increase oxygen levels in water.

Answer:

The oxygen levels in water increase.