Assertion: snail | /r/Desires | serrated edge
Facets:
value: to deter predators
type: PURPOSE
Source sentences:
text: When threatened the snail retracts its foot into the shell and closes the operculum, the calcareous trapdoor that protects the snail’s soft parts, and relies on the serrated edge to passively deter predators from trying to break open the shell (2).