The skill and courage of the Tuskegee airmen served to ​

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Explanation:

they served to decrease opposition to the integration of the armed forces.

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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.