That would be fermentation(anaerobic respiration.)
Fermentation is defined as the extraction of energy from carbohydrates in the absence of oxygen.
I believe it is B.) a system of interacting subsystems or A.) An indivisible unit that is part of the solar system.
<span> The movement of electrons and energy as the </span>carbon atom <span>moves from one reaction to another.</span>
Inconsistent it can vary depending on conditions as well as structure elevation