Assertion: echinoderm | /r/HasProperty | exception
Facets:
Source sentences:
text: Echinoderms are an exception having both a coelomic circulatory system (i.e., the water vascular system) and a haemal circulatory system (i.e., the haemal and perihaemal systems).
text: Echinoderms usually have five appendages (arms or rays), but there are some exceptions.