Explain how a small occurrence, such as a farmer fertilizing a field, could result in a major change in the ecosystem of a pond. BTW this is on algae blooms

Explanation:

Nutrient pollution is the process where too many nutrients, mainly nitrogen and phosphorus, are added to bodies of water and can act like fertilizer, causing excessive growth of algae. Nutrients can run off of land in urban areas where lawn and garden fertilizers are used.