Which one of the following is fixed from the atmosphere by bacteria? O magnesium
O phosphorus
O nitrogen
O sulfur
O potassium

The answer is C. nitrogen

Explanation:

its fixed by a bacteria know as rhizobium

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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.