Assertion: sea urchin's system | /r/HasProperty | simple
Facets:
value: relatively
type: DEGREE
value: compared to other marine life
type: OTHER
Source sentences:
text: The digestive system of echinoderms is relatively simple and primitive compared to other marine life; some species ingest and expel waste through the same orifice.
text: Nervous and circulatory systems are simple, and there are apparently no respiratory or excretory systems.