5. What is the system that
permits movement and
fixation to echinoderms?

Gap-fill exercise

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The system that movement and
fixation substrates in echinoderms
called the ambulacral . In these
animals enters through a
called madreporite, passes
channels and reaches
ambulacral feet in under surface of
body. In the region in
contact the substrate, there
tube feet filled emptied by water
acting as suckers.