Assertion: wolf | /r/CapableOf | help keep the moose population
Facets:
value: in check
type: OTHER
value: in turn
type: TEMPORAL
Source sentences:
text: On a secluded island in Lake Superior, captive wolf packs and moose populations depend on one another for survival: The moose are the wolves' chief nutritional source, and the wolves, in turn, help keep the moose population in check.