Assertion: sea urchin's teeth | /r/HasProperty | extruded hiding places
Facets:
value: to scrape other food
type: PURPOSE
value: in coral
type: LOCATION
value: in rock
type: LOCATION
value: to scrape algae
type: PURPOSE
value: typically
type: DEGREE
Source sentences:
text: The teeth of Aristotle’s lantern are typically extruded to scrape algae and other food from rocks, and some urchins can excavate hiding places in coral or rock—even in steel.