AP BIOLOGY

Detailed explanation-1: -Wetlands are not considered freshwater ecosystems as there are some, such as salt marshes, that have high salt concentrations-these support different species of animals, such as shrimp, shellfish, and various grasses.

Detailed explanation-2: -Estuaries and their surrounding wetlands are bodies of water usually found where rivers meet the sea. Estuaries are home to unique plant and animal communities that have adapted to brackish water-a mixture of fresh water draining from the land and salty seawater.

Detailed explanation-3: -Estuaries are bodies of water where rivers meet the sea. They provide homes for diverse wildlife, including popular fish species. They also support recreation, jobs, tourism, shipping, and more.

Detailed explanation-4: -There are many types of freshwater ecosystems. Rivers, lakes, ponds and streams are the most common freshwater sources.