How Do Fuel Cells Differ from Traditional Electrochemical Cells (Batteries)

How do fuel cells differ from traditional electrochemical cells (batteries) ?

A) The supply of reactants is continually renewed.
B) The cell potentials generally are lower.
C) The cell potentials generally are higher.
D) Fuel cells are closed systems; batteries are open systems.
E) Fuel cells do not involve oxidation-reduction reactions.

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