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Answer» Hi.
here is your answer. .
● They are aquatic, mostly marine, sessile or free swimming, radially symmetrical animals.
● The name cnidaria is derived from the cnidoblast or cnidocyte present on the tentacles of the body.
● Cnidoblast are used for anchorage, defence and for the capture of prey
● Cnidarians exhibit tissue level of organisations and are diploblastic.
● They have CENTRAL gastro vascular cavity with SINGLE opening.
● Some of the cindarians exhibit 2 basic bodies forms called polyp and medusa
● The former is a sessile and cylindrical form like hydra, adamsia etc.
● example - physalia , adamsia, pennatula and meandriana...
hope it HELPS you. ☺
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