Assertion: echinoderm's tube foot | /r/HasProperty | contracted by the redistribution of fluid
Facets:
value: between the internal sac
type: OTHER
value: between the foot
type: OTHER
Source sentences:
text: The water vascular system assists with the distribution of nutrients throughout the animal's body and is most obviously expressed in the tube feet which can be extended or contracted by the redistribution of fluid between the foot and the internal sac.