A group of fish characterised by a cartilaginous skeleton, well-known species include the great white shark and the great hammerhead shark.



shark, sharks, great white shark, great hammerhead, cartilaginous fishes, dorsal fin, gill, heterocercal caudal fin, animal, vertebrates, fishes, aquatic lifestyle, predator, biology

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Extinct species of fish which had thick ´armour´ protecting the head.


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Blood vessels in fishes' gills absorb oxygen and release carbon dioxide.

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Living fossil, important stage in the evolution of tetrapods.

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