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+.   

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