A cell is the smallest unit of living matter
        
             
        
        
        
Answer:
Osteoclasts are the multinucleate bone cell that are responsible for absorbing bone tissue during healing and growth while osteoblasts are the cell responsbile for formation of new bones.
If there will be greater amount of osteoclasts than osteoblasts than the osteoclasts will allow calcium, present in bones to get dissolve which causes deformity of bones known as Osteoporosis (demineralization of the bones).
<em>Due to this the calcium level will increase in the kidney and can cause kidney stone as well.</em>
 
        
             
        
        
        
Answer:
These are needed to mimic the blood vessels which these organs will use for the supply or drainage of fluids e.g blood.
In addition the empty tunnels serve as the routes for nutrients and oxygen supply  for the organ.
In summary the tunnels provided  a vascular structure to support the organ
Explanation: