Assertion: starfish | /r/HasAspect | tough covering
Facets:
value: on their upper side
type: LOCATION
Source sentences:
text: Sea stars have a tough covering on their upper side, which is made up of plates of calcium carbonate with tiny spines on their surface.
text: Sea stars have a tough covering on their upper side, which is made up of plates of calcium carbonate with tiny spines on their surface.