Assertion: snail's shell | /r/CapableOf | make of essential
Facets:
value: for survival
type: PURPOSE
value: mostly
type: DEGREE
value: for their protection
type: PURPOSE
Source sentences:
text: Tentacles, brain, and heart are just some of the body parts of snails, soft-bodied gastropod mollusks with an attractive and rigid outer shell made mostly of calcium carbonate and essential for their protection and survival.