Assertion: sea otter | /r/CapableOf | keep sea urchin populations
Facets:
value: in check
type: LOCATION
value: under control
type: OTHER
Source sentences:
text: Sea otters are an important species in the food chain—for instance, they keep sea urchin populations under control so the urchins don’t eat all the kelp, which many other species depend on for protection from predators.
text: When present in healthy numbers, sea otters keep sea urchin populations in check.
text: When present in healthy numbers, sea otters keep sea urchin populations in check.