Last two (11^th and 12^th) pairs of ribs are different from all other ribs because

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dorsally they are attached to the thoracic vertebrae

intercostal muscles are not attached to them

they join the tenth rib with the help of hyaline cartilage

ventrally they are attached neither to the sternum nor to the cartilages of other ribs

answer is D.

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Detailed Solution

The last two pairs of ribs are called floating ribs (vertebral ribs). They are dorsally attached to the thoracic vertebrae but are ventrally free.

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