A19-year-old woman has painful ulcers on the labial mucosa and buccal mucosa of 4 days duration. she has had similar ulcers on previous occasions, and each time the lesions healed in approximately 7 days. the best diagnosis is

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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.