Assertion: sea urchin's system | /r/HasProperty | circulatory
Facets:
Source sentences:
text: Like other echinoderms the Sea Urchin doesn’t actually have a brain and just relies on their water vascular systems, which basically works like are circulatory system.
text: Sea urchins do not have a brain and instead rely on their water-vascular system– a circulatory system that comprises of water-filled channels which run through the body of the sea urchin.