how do echinoderms (sea stars, urchins and sea cucumbers) move?
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echinoderms (sea stars urchins and sea cucumbers) move by crawling. they have some internal tubules and canals in their body which releases sea water. this water helps in the inflation of tube feet helping them to move.
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Echinoderms primarily use their tube feet to move about, though some sea urchins also use their spines. ... A few species creep around on pointed tube feet. Starfish extend their tube feet in the intended direction of travel and grip the substrate by suction, after which the feet are drawn backwards.
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