Assertion: sea urchin | /r/PartOf | group
Facets:
Source sentences:
text: Sea urchin belongs to a group called Echinodermata phylum, Echinoidea class and order Echinoida.
text: Sea urchins belong to the group called Invertebrates (which means 'animals without backbones') and to the phylum called Echinoderms, in which there are over 6000 species of animals.