Assertion: chordate's skeleton | /r/MadeOf | bone
Facets:
Source sentences:
text: Cartilaginous fishes have a skeleton that is made of cartilage instead of bone.
text: Invertebrate Vertebrate Definition Animals without a backbone Animals with an internal skeleton made of bone are called vertebrates.
text: Most vertebrates have a bony spine, and a whole skeleton made of bones, but some has cartilage instead.