The correct answer is C, Oxygen.
During aerobic cellular respiration, oxygen combines with hydrogen ions and water is released as a by-product of respiration. 
Explanation; 
Cellular respiration allows organisms to release energy stored in chemical bonds of glucose, and other nutrients. The energy in glucose or other nutrients such as fats is used to produce ATP, which cells use to supply their energy needs. During aerobic respiration (in presence of oxygen), oxygen is reduced and water is produced together with carbon dioxide as by-products. 
        
                    
             
        
        
        
Answer:
Bind to repressor protein and activate it
Explanation:
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In order for a genetic mutation in a species in result in the formation of new species what must occur. The new species must be unable to breed with the original species. What is the purpose of DNA polymerase.
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Hormones- Person's sex hormones as held to influence behavior or mood.<span />
        
                    
             
        
        
        
Answer:
H2O
Explanation:
H2O is water. Water is organic, but I'm not 100 percent sure this is right.