Circle or highlight the six most common elements found in living things. do the same thing for the five other elements that are also found in the body in smaller quantities.

6- hydrogen carbon nitrogen oxygen phosphorus calcium

5-potassium, sulfur, sodium, chlorine, and magnesium.

poor water quality affects most estuarine organisms, including commercially important fish and shellfish. the pollutants that have the greatest impact on the health of estuaries include toxic substances like chemicals and heavy metals, nutrient pollution (or eutrophication), and pathogens such as bacteria or viruses.