Heterotrophic organisms used the process of fermentation to nourish. What is fermentation? It is a chemical process that requires oxygen. It is a chemical process in which sugar molasses is ingested. It is a chemical process which enables heterotrophs to obtain energy without oxygen
Fermentation is a chemical process which enables heterotrophs to obtain energy without oxygen. If oxygen is not present or an organism is not able to undergo aerobic respiration, pyruvate undergoes a process called fermentation which replenishes NAD+.
