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Animals
Unlike most fishes, sharks do not have muscles that can draw water across their gills. And since fish breathe by drawing oxygenated water across their gills, it follows that sharks need to keep moving in order to get that oxygen into their system. While some sharks can pump water through their gills by opening and closing their mouths, most need to keep swimming. October 8, 2006 Images under license with Gettyimages.com Page: 1 |
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