Dry air might be the answer but honestly I’m not sure if it is
        
                    
             
        
        
        
They both exhibit imperfect competition in that oligopoly has few sellers while monopoly has many sellers.
Or you can say 
Firms have some level of control over prices in both competitive structures.
        
             
        
        
        
Answer:
Lamellae
Explanation:
These lamellae are remnants of osteons whose matrix components have been almost completely recycles by osteoclasts. growth of the bone.
 
        
             
        
        
        
Answer: Option B 
Explanation: The thin layer that forms the outer covering of the cell is known as the cell membrane. It is composed of the lipid bilayer which as embedded proteins. 
This membrane is selectively permeable which means it allows only specific molecules to pass through them.
The main function of cell membrane is to protect the cell from the outer environment and by the invasion of harmful bacteria and viruses.