Question

The skull forms a solid sheet of
protection and ribs form a cage
Why do you think the rib cage is not
a solid sheet like the skull"​

Answer 1

Answer:

if ribs were solid then no use of captain America shield and iron man.....lol

Explanation:

there are different types of cells in the body like astrocydes, dendrocytes, oligodendrocytes and many more which are responsibile to use calcium use to form bones n cartilage etc etc...

and maybe brain is more delicate part