Because the last two sets of ribs are not attached to any other bones in the body,they are called floating ribs.

Name: Because the last two sets of ribs are not attached to any other bones in the body,they are called floating ribs.
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The last two sets of ribs are called floating ribs because they are not attached to the sternum (breastbone) at the front of the body, but they are still attached to the vertebrae at the back.

Because the Last Two Sets of Ribs Are Not Attached