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offers water science units and tools that help students understand and solve real environmental problems using advanced technology. Learn about aquatic ecology, water quality, and watersheds. See maps, summaries, and information on lakes and rivers nationwide. Use data visualization tools to watch data change through time and explore relationships among variables. (National Science Foundation)
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Fish, like other animals, need oxygen to live. As water moves past their gills, microscopic bubbles of oxygen gas in the water -- called dissolved oxygen -- are transferred from the water to their blood. |
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Lake zones |
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