AP BIOLOGY

Detailed explanation-1: -Lakes, ponds, rivers, streams and wetlands that have a low salt concentration (usually below 1%) and serve as habitats are called freshwater ecosystems.

Detailed explanation-2: -Freshwater ecosystems are a subset of Earth’s aquatic ecosystems. They include lakes, ponds, rivers, streams, springs, bogs, and wetlands.

Detailed explanation-3: -Fresh water is found in glaciers, lakes, reservoirs, ponds, rivers, streams, wetlands and even groundwater.

Detailed explanation-4: -River ecosystems are flowing waters that drain the landscape, and include the biotic (living) interactions amongst plants, animals and micro-organisms, as well as abiotic (nonliving) physical and chemical interactions of its many parts.

Detailed explanation-5: -The definition of freshwater is water containing less than 1, 000 milligrams per liter of dissolved solids, most often salt. As a part of the water cycle, Earth’s surface-water bodies are generally thought of as renewable resources, although they are very dependent on other parts of the water cycle.