Assertion: tern's distribution | /r/HasProperty | its 4 subspecies
Facets:
Source sentences:
text: The common tern has a circumpolar distribution, its 4 subspecies breeding in temperate and subarctic areas of Europe, Asia and North America.
text: This bird has a circumpolar distribution, its four subspecies breeding in temperate and subarctic regions of Europe, Asia and North America.