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 sediment; pesticides animal waste; fertilizers inorganic metals; sediment runoff; sewage

 animal waste; fertilizers

Explanation:

The bacteria are small prokaryotic organisms. A large colony of small bacteria can be found in water, air and soil. Some bacteria also grow in the digestive tract of humans and animals. The fecal discharge of animals will contain the bacteria colonies which will contaminate the pond water when drains along with the surface runoff. The nitrogen is element that is required by the plants for their appropriate growth. Usually the soils of the agriculture land lacks nitrogen. The nitrogen in the soils are added up by the fertilizers. The surface runoff will take away the fertilizers and will deposit them to the pond water. This will lead to the contamination of pond water with nitrogen.

the sphincter muscles at the end of the digestive tract is the anus.