Biology — Fermentation
Anaerobic regeneration of NAD⁺.
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\text{glucose} \rightarrow 2\,\text{lactate} + 2\,\text{ATP}
\text{glucose} \rightarrow 2\,\text{ethanol} + 2\,\text{CO}_2
\text{anaerobic: no oxygen}
\text{regenerates NAD}^+