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List some of the differences between cartilaginous fish and bony fish?

List some of the differences between cartilaginous fish and bony fish?

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Cartilaginous fish Bony fish
They have cartilaginous skeleton Their skeleton is made of bones
They are found only in marine water Can be found both in fresh and marine water
Their mouth is ventrally-positioned Mouth is at the anterior tip
Have a single set of oral jaws and 5-7 gills Have two sets of oral jaws and four pair of gills
They exhibit internal fertilization External fertilization
They excretes urea They excretes ammonia
E.g. shark, rays E.g. salmon, rohu
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