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The document describes three types of freshwater ecosystems: 1) flowing water systems like streams and rivers that are home to crocodiles, tortoises, reeds, and lilies; 2) standing water systems like ponds and lakes containing frogs, toads, bushes, and trees; and 3) wetlands like Doñana National Park featuring pelicans, water lenses, sea grass, and cypresses. It also outlines three marine ecosystems: 1) shorelines with rocky and flat areas inhabited by limpets, mussels, and albatrosses; 2) coral reefs containing sea urchins, sponges, and sea anemones; and 3) the open ocean.Read less