Final answer:
Oxidation involves the loss of electrons, gain of oxygen, or loss of hydrogen. Reduction involves the gain of electrons, loss of oxygen, or gain of hydrogen, and both processes occur in redox reactions.
Explanation:
Oxidation is defined as the loss of electrons, gain of oxygen, or loss of hydrogen. Reduction is the opposite, involving the gain of electrons, loss of oxygen, or gain of hydrogen. In redox reactions, oxidation and reduction always occur together.
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