Assertion: gastropod's shell | /r/HasProperty | covered with spine
Facets:
value: to repel predators
type: PURPOSE
value: usually
type: TEMPORAL
Source sentences:
text: The sea urchin, whose ovaries are a prized delicacy, has what would normally be called a shell (covered usually with spines to repel predators), but it belongs to the phylum Echinodermata.