Which immunoglobulin class has a dimeric structure with a secretory component? igm iga ige igg?

The answer is IgA.  The immunoglobulin can occur as a monomer or dimer. The dimeric form is called secretory-IgA because it is also secreted by glands that produce saliva, tears, sweat, and in the lumen of the gastrointestinal tract. It is the most secreted Immunoglobulin.

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.