The overall picture of eutrophication.
D009584:Nitrogen / Q000032:analysis; D010100:Oxygen / Q000032:analysis*; D010758:Phosphorus / Q000032:analysis; D012722:Sewage; D014876:Water Pollution / Q000032:analysis*
D012722:Sewage; D010758:Phosphorus; D009584:Nitrogen; D010100:Oxygen