Carbon dioxide from the yeast comes from a process called fermentation. Fermentation is a cellular respiration process in cells that happens when oxygen is not present. If oxygen is present, the process is called aerobic respiration.
Answer:
C. Producers
Explanation:
Producers (plants) can turn the sun's energy into usable energy by photosynthesis. They are at the bottom of the food chain; all of our energy comes from them. :)
