Bones of snakes are very loosely fused together like in humans. Hence these bones can move individually allowing the snakes to be really flexible. The ribs of snakes do not join like those of humans but instead, have free ends and do not have a sternum. 
 
        
             
        
        
        
Answer:
Vesicles.
Explanation:
Transport vesicles are able to move molecules between locations inside the cell. For example, transport vesicles move proteins from the rough endoplasmic reticulum to the Golgi apparatus.
 
        
             
        
        
        
The A antibodies will produce A antibodies and B antibodies will produce B antibodies
        
             
        
        
        
It is most affected in the surface zone.