yeast cells grown anaerobically can obtain energy by fermentation, which results in the production of

An independent variable that the student controls during the experiment. (i'm not 100% sure this is correct, so i'm sorry if it's wrong)

Answera major is needed to earn a bachelors;

Number 3 is the logical, go-to answer for the classical school of thought as they strongly believe that an individual commits a crime of their own free will and fully understands the  consequences, making them liable to whatever punishment is dealt to them.