Answer:
b. transfer of electron(s).
Explanation:
An oxidation-reduction also called a redox reaction is a
chemical reaction in which electrons are transferred of between two species of reactants. It is a chemical reaction where the oxidation number of an atom, ion, or molecule, increases or decreases by losing or gaining electrons
Biological oxidation-reduction reactions always involve transfer of electrons.
Oxidation involves loss of electrons in which the matter then becomes
positively charged . On the other hand, reduction involves the gain of
electrons and the matter becomes negatively charged.
Oxidation-reduction(Redox) reactions is an important aspect of reactivity of
elements. Atoms begin to react when movement of electrons occurs which
gives rise to their loss and gain.
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