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.
 
        
                    
             
        
        
        
The primary products of the light independent reactions  (after one turn of the cycle) are:
a)  two G3P molecules
b)  three ADP 
c) two NADP+
However ADP and NADP+ are not really "products". They are regenerated and later used again in the Light-dependent reactions.  Each G3P molecule is composed of three carbons. 
For the Calvin cycle (Light independent cycle) to continue, 5 out of  the 6 carbons provided by the two G3P molecules are used to regenerate ribulose 1, 5 phosphate. Therefore there  remains only one carbon for the next turn of the cycle.
One  molecule of glucose requires 6 turns of the cycle. Any extra G3P is used to make starch, sucrose and cellulose. 
 
        
             
        
        
        
Answer:
They help you live longer
Explanation:
 Research has shown that social connections not only impact your mental health, but your physical health as well. A review of 148 studies (308,849 participants) indicated that individuals with stronger social relationships had a 50% increased likelihood of survival.
 
        
             
        
        
        
Nondisjunction is the failure of one or more pairs of homologous chromosomes or sister chromatic. 
        
             
        
        
        
Its the the number of proteins and neutrons in the atom.