Assertion: shark | /r/CapableOf | use forward movement
Facets:
value: to control vertical position
type: PURPOSE
value: unlike most species of fish
type: OTHER
Source sentences:
text: Unlike most species of fish which use swim bladders to stay buoyant, sharks use forward movement to maintain their vertical position in the water.
text: It doesn't have a swim bladder, so it uses its forward movement to control vertical position.