Question

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

Answer 1

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