The Gills push the oxygen-very poor h2o out as a result of openings in the edges in the pharynx. Cartilaginous fish have several gill openings: sharks normally have five, from time to time six or seven pairs; they normally really need to swim to oxygenate their gills. Bony fish have https://maps.app.goo.gl/9y4LfCmrsyYSbzTo6
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