In a exam, 80 students passed in maths, 70 students failed in maths 90 failed in both. How many students were passed in science? how many passed the both?

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.

where is the scientific experiment?