Its body cavity is filled with sea water.Skeleton is used to extend its body & tentacles. ![]() It provide support & resistance to the contraction of muscles so that mobility results.In animal that lack the hard skeleton, a fluid filled cavity act as a hydrostatic skeleton.Internal pressures generated by muscle contractions cause movement as well as maintain the shape of the animals, such as the sea anemone and worms. It consist of fluid-filled closed chambers. ![]()
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