______ ribs (two pairs) are not attached to the sternum.

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Solution

Floating ribs
The last two pairs of ribs are floating ribs because they are not attached to the sternum.
The floating ribs are less stable and risk breaking because they have only one attachment dorsally to the vertebrae and have very thin bone tissue locked in muscle as they extend laterally.
Final answer: Floating ribs (two pairs) are not attached to the sternum.

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