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Freshwater habitats include the still waters of lakes and ponds and the flowing waters of rivers and streams. Lakes and ponds vary tremendously in size and and in biodiversity. The can all be divided into 3 major zones: the littoral zone is relatively warms because of its exposure to sunlight. Organisms living the littoral zone include photosynthetic plants and algae, insects, mollusks, crustaceans, fishes, amphibians, ducks, and turtles. The limnetic zone includes habits that are close to the water surface but far from shore. Its occupied largely by plankton. Phytoplankton are photosynthesizing plankton, whereas zoo-plankton are heterotrophic plankton. Fish may also be found in the limnetc zone. The profundal zone describes deep water habitats in ponds and lakes.

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15y ago

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