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What is the difference between fish and sharks?

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sharks - have rows of teeth, no scales, can't stop swimming & can't swim backwards, need constant water flow over gills, cartilage - no bone, oily liver instead of a swim bladder, can sense electricity (ex:heart beat) & vibrations in water, gill slits - no gill cover, eggs fertilized inside females body.
fish - 1 set of teeth or none at all, can hover & swim backwards, most are bony, swim bladder, can't sense electricity, covered gill slits, eggs usually fertilized in water.
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