With which of the four complexes in the electron t ransport chains is each of the following events as sociated? (There may be more than one correct answer in a given situation.) a. The metal iron is present in the form of Fe2+ and Fe3+ ions. b. FADH2 is needed as a reactant. c. The metal copper is present in the form of Cu+ and Cu2+ ions. d. Cytochromes are needed as reactants

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