Answer:
respiration
The source of the energy required to regenerate ATP is the chemical energy stored in food (e.g. glucose). The cellular process of releasing energy from food through a series of enzyme-controlled reactions is called respiration . Some of the energy released is used to produce ATP.
Explanation:
all based on research.
 
        
             
        
        
        
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Answer:
Carbohydrate intake before trial. 
Explanation: