Answer:
Hi
The term I would use is that they are anaerobic microorganisms.
Step-by-step explanation:
Since they have a metabolism that generates their energy from substances in the absence of oxygen. They practically do it through fermentation processes. This fermentation process of anaerobic microorganisms comprises a series of processes, which interact with each other, in a series of metabolic reactions in the absence of oxygen. These metabolic processes are divided into 3 groups: 1) hydrolysis and fermentation, 2) acetogenesis and 3) methanogenesis.