The Punnett square shows the cross for a particular trait between a homozygous dominant parent and a heterozygous parent.

What is the probability the offspring will be heterozygous for this trait
PLEASE HELP NO

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.

the correct answer is 2 and 4