Your alien friend from planet Xenon is visiting and wants to learn how to breed pea plants

The purple gene is dominant over the white gene. So the offsping all have purple flowers but they carry the gene for white flowers

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.