An increase in food and a decrease in predators would most likely genetic variation in a population

increase
An increase in food and a decrease in predators would most likely increase genetic variation in a population

Explanation:

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 is the correct answer