What happens when electrons are passed doe the electron transport chain

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your answer to this respone is

The electrons passing through the electron transport chain gradually lose energy, High-energy electrons donated to the chain by either N.A.D.H or FA.DH2 complete the chain, as low-energy electrons reduce oxygen molecules and form water. The end products of the electron transport chain are water and A.T.P..

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Faith

an active site is a region that is present on an enzyme where the reactants or the substrate molecules we can say bind and experience a chemical reaction. the substrate is basically a reactant whose concentration is changing and that is converting into a product after binding at the active site of an enzyme

i might be wrong but i think its a. let me know if i’m right and have a good rest of your day!