Assertion: sand dollar's spine | /r/ObjectUse | used for locomotion
Facets:
value: primarily
type: DEGREE
value: against predators
type: TRANSITIVE-OBJECT
Source sentences:
text: The spines are also used for locomotion, along with a series of tube feet, so called because they are operated by a hydraulic system controlled by the main body.
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.