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System which permits fixation and movement to echinoderms

Write down the system which permits fixation and movement to echinoderms?

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The system which permits fixation and movement to substrates in the echinoderms is named as ambulacral system. In these animals water enters throughout a structure which is named as madreporite, passes throughout channels and reaches ambulacral feet in undersurface of body. In ambulacral region in contact with substrate, there are tube feet filled and emptied by water therefore acting as suckers.

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