Answer:
A: By breaking and reforming chemical bonds in the molecules
Explanation: 
There is energy stored in chemical bonds between food molecules, called ATP.  When chemical bonds are created, some energy is stored in those bonds.  When one of these bonds are broken, the energy that was stored is released, and can then be used by your body.  Your body then uses a different type of energy, called ADP, to reform the bonds, which then go on to become waste products.
I hope this helps! 
<h2><u>
PLEASE MARK BRAINLIEST!</u></h2>
 
        
                    
             
        
        
        
I think they are all biotic factors..hmm if not take out whichever sounds the most not fitting.
        
                    
             
        
        
        
Since you provided no answer choices, I will assume the correct answer choice is ANCESTOR. A cladogram begins with a common ancestor of all the organisms represented above. 
        
                    
             
        
        
        
4 mps increase in 10 seconds = 2 mps increase in 5 seconds = .4meters/2sec