Similar to those performed by the cell organelles in group b
        
             
        
        
        
Glial cells. More specifically, it could be oligondenrocytes, astrocytes, ependymal cells, schwann cells, microglia, or satellite cells, because they are all types of Glial cells. 
        
             
        
        
        
I think it’s “a Protein molecule”
        
             
        
        
        
Answer:
A. Mutualism
Explanation:
<u>Mutualism</u> The bristle worm living with the hermit crab.