D. He has an aerator that pumps bubbles into the tank
        
                    
             
        
        
        
Answer: Y goes to proteins.
Explanation:
Enzymes, which are a form of protein, are used by the cell to accelerate chemical reactions.
 
        
             
        
        
        
Transport proteins- an example of a protein in the plasma membrane is integral proteins, which main function is to transport molecules across the membrane. Hope this helps :)
        
             
        
        
        
Answer:D can occur in animals through binary fission
Explanation: