Assertion: echinoderm's system | /r/Synonym | a water vascular system
Facets:
Source sentences:
text: Instead, they rely on water for their circulatory system, which is called a water vascular system.
text: Echinoderms have no heart, brain or eyes; they move their bodies with a unique hydraulic system called the water vascular system.
text: These animals possess a true coelom that is modified into a unique circulatory system called a water vascular system.