Answer:
Some don't because of many things, disease and not getting enough food.
Explanation:
 
        
             
        
        
        
5 ........................
        
             
        
        
        
Answer:
Bones are organs composed of hard living tissue providing structural support to the body – it's scaffolding. It is a hard matrix of calcium salts deposited around protein fibers. Minerals make bone rigid and proteins (collagen) provide strength and elasticity. ... The outer layer of bone is called Cortical bone.