Assertion: rib cage | /r/MadeOf | up of 12 pairs of ribs
Facets:
Source sentences:
text: It is made up of 12 pairs of ribs.
text: The rib cage is composed of 12 pairs of ribs plus the sternum for a total of 25 separate bones.
text: The rib cage is made of twelve pairs of ribs, their costal cartilages, the sternum, and the thoracic vertebrae.