Assertion: whale | /r/CapableOf | play vital role
Facets:
value: in maintaining the productivity of phytoplankton
type: TRANSITIVE-OBJECT
Source sentences:
text: At the top of the food chain, whales play a vital role in the overall health of the environment.
text: The Gulf of Maine study also found that the view of whales and other marine mammals as competitors for fishing, advocated by some nations, is incorrect as whales play a vital role in maintaining the productivity of phytoplankton and consequently the fish.