By speed sonic wins by far
        
                    
             
        
        
        
Answer: none of the above 
Explanation:
None of the above
 
        
             
        
        
        
Answer:
The correct answer is option b. "the citric acid cycle".
Explanation:
The citric acid cycle is one of the most important pathways of the cellular metabolism because of its role in energy production and biosynthesis. The citric acid cycle is where most of the CO2 from catabolism is released. This happens by the release of two molecules of CO2 per turn in the cycle, using the two atoms of carbon from acetyl CoA.
 
        
             
        
        
        
Thermal energy could be an answer
        
                    
             
        
        
        
Answer:
gene pool? species? 
Explanation:
Question is a bit vague hope this helped tho :(