Amolecule that protects cells by preventing oxidation is known as a(n)

The answer is Antioxidant. It is has a compound ability to prevent or repair the damage caused by oxidation. These nutrients Vitamin E, Vitamin C, Beta-carotene, Vitamin A, and Selenium serve as antioxidants. Primary role is as an antioxidant and improves immune function. Protects polyunsaturated fatty acids (PUFAs) in cooking oils and in the plasma membrane.

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.

weathering is the answer.