Two containers, X and Y, were each filled with the same amount of dough mixture for bread making. Yeast was added to the mixture in Y. The containers were then placed in a warm place for two hours. The diagram shows how they looked after this period. Which substance made by the yeast is responsible for the difference between containers X and Y?
- Aalcohol
- Bcarbon dioxide
- Clactic acid
- Doxygen