Oxidation and reduction reactions are typically linked within a cell. They are part of most matter and energy transformations necessary for vital life function.
-Oxidation-reduction reactions

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Oxidation-reduction (redox) reactions involve the transfer of electrons from one molecule to another. In these reactions, one substance is oxidized (loses electrons) and another is reduced (gains electrons). This process is fundamental to cellular respiration and photosynthesis, among other biochemical pathways.

Oxidation and Reduction Reactions Are Typically Linked Within a Cell