Insulin is the correct answer.
Hope ti helped!
        
             
        
        
        
Active transport is the movement of dissolved molecules into or out of a cell through the cell membrane, from a region of lower concentration to a region of higher concentration. The particles move against the concentration gradient , using energy released during respiration .
        
             
        
        
        
The answer is D) proteins 
 
        
             
        
        
        
The spinal cord is surrounded by bones (vertebrae), extends downward from the base.