When does ovulation typically occur? a. midway between menstrual periods b. immediately after conception c. the day a menstrual period begins d. the day after a menstrual period ends

A. it typically occurs 14 days before your next period. Therefore is is the closest answer.

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.