Differentiate between chondrichthyes and osteichthyes.

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Chondrichthyes	Osteichthyes
They are marine	Both marine and fresh water
Cartilagenous endoskeleton	Bony endoskeleton
Mouth is located ventrally	Mouth mostly terminal
Gills without operculum	With operculum
Skin covered with placoid scales	With cycloid / ctenoid scales
Due to absence of airbladder, have to swim constantly to avoid sinking.	Air bladder present which regulates they buoyancy.

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