Assertion: rodent | /r/HasAspect | old fossil history
Facets:
value: very
type: DEGREE
value: as a group
type: MANNER
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).