Answer: that is the answer 
supplying oxygen and nutrients to tissues,Explanation:
 
        
                    
             
        
        
        
Answer:
Transporting Electrons
As the high-energy electrons are transported along the chains, some of their energy is captured. This energy is used to pump hydrogen ions (from NADH and FADH2) across the inner membrane, from the matrix into the intermembrane space. Electron transport in a mitochondrion is shown in Figure below.
Explanation:
 
        
             
        
        
        
The answer is A.) Layers 
  hope it helps.
        
                    
             
        
        
        
Carbohydrates, such as sugar and starch, for example, are readily broken down into glucose, the body's principal energy source. Glucose can be used immediately as fuel, or can be sent to the liver and muscles and stored as glycogen.The body constantly uses and replenishes its glycogen stores.