Assertion: echinoderm's spine | /r/ObjectUse | used for locomotion
Facets:
value: against predators
type: TRANSITIVE-OBJECT
value: primarily
type: DEGREE
Source sentences:
text: Spines are primarily used for locomotion and defense against predators, although some species cover them with shell fragments, algae, or encrusting organisms to camouflage themselves from visual predators or, alternatively, to provide shade from direct sunlight.