Assertion: frilled shark | /r/Synonym | living fossil
Facets:
value: sometimes
type: TEMPORAL
Source sentences:
text: The frilled shark, or eel shark, is called a “living fossil” because it is so much like some extinct sharks that are found preserved in rocks.
text: Frilled sharks are sometimes called “living fossils” because they’re thought to be very similar to a prehistoric ancestor that lived eighty million years ago.