A phage is improperly assembled, so that it does not receive DNA within its head. What effect will this have on the phage

The phage will not be able to infect a bacterial host cell.

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.