Please help, I dont have alot of time lol
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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.

b brown mice / white sand dunes

the fossil record provides evidence of a common ancestor to many species.