Correct Answer (Detailed Explanation is Below)
A.
Yeast
Detailed Explanation
Yeast is a unicellular fungus widely used in fermentation. During anaerobic fermentation, yeast converts sugars into
ethanol and carbon dioxide. Carbon dioxide helps bread dough rise, while ethanol is important in alcoholic fermentation. Yeast is therefore an important example connecting
biology, microbiology, fermentation and biotechnology.