Apond near a city park is found to be contaminated with both bacteria and excess nitrogen. the bacteria most likely came from and the excess nitrogen most likely came from

Excess nitrogen is brought in the pond from the fertilizer, which are ladden in nitrogen and phosphorous, and rain water or running water takes that nitrogen to the water bodies.Bacteria must have come from the sewage disposal in the pond. Sewage is rich in organic material and allows proliferation of bacteria, which is taken to the pond when the sewage is disposed in the pond.

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