Bread dough rises after yeast is mixed in. Which gas makes the dough rise?

1. Yeast is a microorganism that feeds on the sugar in the dough. 2. As it feeds it produces carbon dioxide and alcohol. 3. Bubbles of carbon dioxide are trapped in the dough and push it upwards. 4. The alcohol is driven off later when the bread is baked. _Source: Siyavula Natural Sciences Grade 8 (CC BY 4.0), Useful microorganisms_