Assertion: arthropod's ancestor | /r/HasProperty | common
Facets:
Source sentences:
text: Arthropods share a common ancestor with polychaete worms, and may even be a direct descendant of polychaetes.
text: Scientists think annelids and arthropods share a common ancestor, or even that annelids are the ancestors of arthropods since there are species such as velvet worms that appear intermediate between them.