Assertion: rodent's incisor | /r/ObjectUse | used for gnawing
Facets:
Source sentences:
text: The condition of a dominant pair of incisors used for gnawing, followed by a long diastema, is not unique to rodents, and in fact rodents are relative latecomers to this condition (even though as a group, they have a very old fossil history, going back to Paleocene times).