What is a possible negative effect of excess phosphorus in the water?

Too much phosphorus can cause increased growth of algae and large aquatic plants, which can result in decreased levels of dissolved oxygen– a process called eutrophication. High levels of phosphorus can also lead to algae blooms that produce algal toxins which can be harmful to human and animal health

what school and grade?

where in your body is there an enzyme that does function at a high or low ph? what is the name of that enzyme and its function?