'Z' is a protective structure. 12 pairs of flat bones in this structure are attached to 'Y' on one side and 'X' on the other side. 'Y' is flexible and is made of 33 bones. Identify X, Y and Z.

X: Ribs; Y: Spine; Z: Vertebral column

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X: Sternum; Y: Spine; Z: Ribcage

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X: Spine; Y: Ribs; Z: Skull

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X: Ribs; Y: Skull; Z: Ribcage

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Solution

The correct option is B X: Sternum; Y: Spine; Z: Ribcage
$∙$ In the chest, there is one vertical, flat bone called the sternum.
$∙$ Twelve pairs of flat bones called ribs are joined to it, sideways.
$∙$ Ribs are joined to the spine at the back, forming a cage like structure called the rib cage.
$∙$ Rib cage protects the heart and lungs.

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