List out any six general features of cartilaginous fishes.
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Features of cartilaginous fishes
(i) Cartilaginous endoskeleton is present.
(ii) These are mostly marine, poikilothermic animals.
(iii) Notochord is persistent throughout the life.
(iv) Placoid scales are present.
(v) Heart is two-chambered with one auricle and one
ventrical.
(vi) Tail fin is always heterocercal.