Distinguish between bony fish and cartilaginous fish

1.	Distinguish between bony fish and cartilaginous fish
Answer» \t\xa0CARTILAGINOUS FISHES\xa0BONY FISHES\xa01) Their endoskeleton is primarily made of cartilage.1) Their endoskeleton is entirely made of bone.\xa0\xa02) Their exoskeleton is made of placoids.2) Their\xa0exoskeleton is made up of cycloids or thin bony plates.\xa0\xa03) The position of their tail is heterocercal.3)\xa0Their tail fin is homocercal.\xa04) They have 5 gills that are overly exposed (no operculum).4) They have an operculum on either side of their gills.5) In them the fertilization is through internal mechanisms.5)\xa0They fertilize their eggs externally.\xa0\xa06) Eg-\xa0dog fish, electric ray torpedo and sharks.6) Eg- fying fish, globe fish and sea horses.\t

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