Why is yeast used for carbonation in root beer?

Yeast is used for carbonation in root beer because it ferments sugars present in the brew, producing carbon dioxide as a byproduct. This natural fermentation process creates bubbles, giving root beer its fizzy texture. Additionally, using yeast can enhance the flavor profile, contributing to the overall taste of the beverage. However, in many commercial root beers, carbonation is often achieved through forced carbonation instead of fermentation.