Assertion: echinoderm's vascular system | /r/HasProperty | contracted by the redistribution of fluid
Facets:
value: between the foot
type: TRANSITIVE-OBJECT
value: between internal sac
type: TRANSITIVE-OBJECT
Source sentences:
text: These are extensions of the water vascular system which poke through holes in the skeleton and can be extended or contracted by the redistribution of fluid between the foot and internal sac.