Final answer:
Animal waste, trash, chemical spills, fertilizer, and pesticide are all sources of watershed pollution. They can originate from identifiable locations (point sources) or from widespread areas (nonpoint sources), leading to detrimental effects on water bodies and aquatic ecosystems.
Step-by-step explanation:
The sources of watershed pollution mentioned in the student's question—animal waste, trash, chemical spills, fertilizer, and pesticide—all contribute to the contamination of water bodies. Hence, all the provided options are correct.The pollutants can enter water supplies from multiple avenues, including both point sources and nonpoint sources. Point sources are specific and identifiable locations such as animal factory farms or discharge pipes from factories, whereas nonpoint sources are diffuse and widespread, such as runoff from agricultural fields or urban areas that carry contaminants like fertilizers and pesticides into water bodies. These pollutants can have various impacts, including nutrient pollution leading to eutrophication and algal blooms, which deplete oxygen in the water and harm aquatic life.