Question

the thoracic cage
rib pairs 11 and 12 are known as:
true ribs vertebrochondral ribs vertebrosternal ribs vertebral ribs
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Explanation:

Rib pairs 11 and 12 are known as floating ribs or vertebral ribs because they do not attach anteriorly to the sternum or to the costal cartilage of another rib.

Answer:

Vertebral ribs