Which types of animals are kept in metazoa​

The rest of the animals -- including fish, birds, amphibians, reptiles and mammals -- are all multicellular and are collectively referred to as the Metazoa. Several lines of evidence indicate that choanozoans gave rise to sponges, which are the most primitive metazoans.

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.