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The best answer is C - to break down food into nutrients.
The digestive system  breaks down food  into its simplest form that cell are able to utilize  for energy.  Food is broken down into its monomer units. Proteins are broken down into amino acids, lipids are broken down into fatty acids and glycerol and carbohydrates are broken down into glucose. 
Glucose is then absorbed into the blood and transported to every cell in the body. The cells take in glucose and use it as fuel and raw material  in the process of cellular respiration. From one molecule of glucose, 36 to 38 molecules of ATP ( the form of energy used by cells) are produced.
 
        
                    
             
        
        
        
This occurs when a molecule of adenosine diphosphate (ADP) uses the energy released during cellular respiration to bond with a thirdphosphate group, becoming amolecule of ATP. So the energy from cellular respiration is stored in the bond between the 2nd and 3rdphosphate group
        
             
        
        
        
False because it's using energy to do the work. one way to gain energy is by making it. but yet again this is my thought but like i said it's false. 
        
                    
             
        
        
        
Answer:
DNA, RNA, Proteins, the genetic code, ribosomes, phospholipid membranes, DNA polymerase for DNA replication, RNA polymerase, ATP-ase (=ATP synthase).
Explanation:
Reductive Citric Acid Cycle is not present in the anaerobic organisms.