Question

when nitrogen and phosphorous runoff from agricultural areas, it can run into surface waters, setting off a chain reaction that starts with an algal bloom and ends with an area of low oxygen. what do we call this process? ecology eutrophication

Explanation:

Eutrophication is the process where excess nutrients (like nitrogen and phosphorus) from runoff cause algal blooms. These blooms deplete oxygen in water as algae decompose, leading to low - oxygen areas. Ecology is a broader field of study about organisms and their environment, not this specific process.

Answer:

B. Eutrophication