Assertion: shark's skeleton | /r/CapableOf | explain this shark's persistence
Facets:
value: in the fossil record
type: TEMPORAL
value: in the world's oceans
type: LOCATION
Source sentences:
text: The cartilaginous skeleton of Hybodus was unusually tough and calcified, explaining this shark's persistence both in the fossil record and in the world's oceans, which it prowled from the Triassic to the early Cretaceous periods.