Assertion: migration | /r/HasProperty | important
Facets:
Source sentences:
text: Migration is important in cetaceans, including whales, dolphins and porpoises.
text: Migration in the F-K domain is an important method since it is by far the quickest assuming constant velocity and is accurate to 90o.
text: clear that migration is an important population phenome-
text: Migration is so important that the Islamic calendar is based upon the Hijra, Mohammed’s migration from Mecca to Medina.