Bones in the inner ear
The hair cells are located in the cochlea which is situated in the temporal bone
        
                    
             
        
        
        
Answer:
The correct answer will be- to synthesise the ATP molecules in respiration process.
Explanation:
The electron transport chain is the last phase of the cellular respiration which helps in the synthesis of a large number of ATP molecules.
The ATP molecules are synthesized when the energy generated by the movement of protons through CF₀ unit takes place.
The movement of electrons in the chain leads to the movement of proton from the mitochondrial matrix to the intermembrane space. This creates the proton gradient across the membrane which to equilibrate the protons move down the concentration gradient through ATP synthase. The energy while this is used to rotate the ATP synthase which coverts the ADP to ATP.
Thus, to synthesise the ATP molecules in the respiration process.
 
        
             
        
        
        
It is 200 million years because it has been around for a long time.
        
                    
             
        
        
        
Catalysis An enzyme may catalyse a reaction by stressing or
destabilizing the bonds of the substrates. This point in the enzymatic reaction
is known as the Transition State.  An
enzyme can couple a nonspontaneous reaction to a spontaneous reaction so that
anabolic processes will occur.