If the ribcage were a solid sheet like the skull, it would be difficult for the thoracic cavity to expand and contract with inspiration and expiration.
The rib cage is not a solid sheet like the skull because it protects the heart and the lungs
come on such an easy question obviously its the solid sheet masuma raza
helmet = skull cage = ribs (as in "rib cage")
the sheet
The skull provides protection for the brain. The ribs form a cage to protect the heart and lungs.
Yes they do ! They have a complete skeleton including skull, spine and rib-cage.
the cranium known as the skull
the skull
Skull is solid and immobile in order to protect the brain. Thorax has to be mobile in order to do respiration. For this purpose it contracts and expands, periodically. This is not possible for solid bone combination like skull.
to protect your fragile insides
Axial
pelvis