* Photosynthesis: Plants and some bacteria use sunlight, water, and carbon dioxide to produce glucose (C₆H₁₂O₆) through photosynthesis. This process is where carbon atoms from CO₂ are incorporated into organic molecules.
* Fermentation: Yeast and other microorganisms break down glucose in the absence of oxygen through fermentation. This process produces ethanol (C₂H₅OH) and carbon dioxide as byproducts.
* Ethanol Production: The ethanol produced through fermentation is the same ethyl alcohol we find in alcoholic beverages and other applications.
Therefore, the carbon atoms in ethyl alcohol originate from the carbon dioxide that plants and bacteria absorbed during photosynthesis.
