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The Thoracic Cage

7. The Skeletal System / The Thoracic Cage / Problem 1

There are 12 pairs of rib bones and the last two are called floating ribs. Why is that the case:

A

They articulate with the 10th ribs and attach to the sternum

B

They are significantly shorter than the other rib bones but attach directly to the sternum

C

The last two rib bones are fused

D

They are short bones that do not attach to the sternum

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