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radial cleavage and the formation of the mouth at the end of the embryo opposite the blastopore
slow moving and sessile, skeletal bumps and spines, water vascular system, hydraulic canals that branch into extensions called tube feet that function in locomotion, feeding, and gas exchange, sexual involving separate males and females. Gametes are usually released into the water
Sea stars, multiple arms that radiate from a central disk, tube feet are located on the undersurface of the arms, muscular and chemical actions by the tube feet allow the to attach and detach, suction is not involved in movement, tube feet shells of clams and oysters turn their stomachs inside out and protrude it through their mouth secretes saliva that digests the soft body of the clam or oyster right inside the clam or oyster shell,
Brittle stars have a distinct central disk and long, flexible arms, serpentine movements of the arms for locomotion, chemical action by the tube feet allow for substrate attachment, suspension feeders while others are predators or scavengers
Sea urchins and sand dollars have 5 rows of tube feet for movement, long spins of the sea urchin also aid in movement and provide protection, the spines are long and sharp and can inflict a painful wound, nternal organs are enclosed in a hard test, Sea urchins feed on seaweed,
feather stars crawl about by using their long flexible arms, more than 5 arms, sea lily and the feather star are suspension feeders,
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