Assertion: sea urchin's tube foot | /r/CapableOf | use in gas exchange
Facets:
value: often
type: TEMPORAL
Source sentences:
text: Â Echinoderms all share basic similarities in their habits and body design: they are all totally marine; all bottom-dwelling (benthic); are unique in the animal kingdom in having a five-part body symmetry; and a water-vascular system of muscular internal canals which provides hydraulic power for hollow, muscular tube feet that used in movement, attachment, feeding, and often gas exchange.