Boxes on trees in swamps give wood ducks a place to build their nests. Platforms built on top of telephone poles provide a place for eagles to make their nests. In backyards and parks, people may set up houses for bats, birds, or toads. How do these artificial homes affect resources in the animal's environments? How does this in turn affect population size

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.

cells spend most of their time in interphase