Anaerobic digestion
Anaerobic decomposition or anaerobic digestion.
fermentation
Respiration
cellular respiration
The release of energy from food molecules in the absence of oxygen is called anaerobic respiration. When there is oxygen present it is called aerobic respiration.
Fermentation is an energy releasing process that does not require oxygen. Through fermentation, cells can produce energy without the presence of oxygen by breaking down sugars into simpler molecules and generating ATP.
Organisms can obtain energy in the absence of oxygen through a process called anaerobic respiration. This involves breaking down molecules like glucose without using oxygen. Different organisms may use different pathways such as fermentation to produce energy without oxygen.
mitochondria
Decomposers, like fungi and bacteria, use oxygen during the process of breaking down organic matter. Oxygen helps to facilitate the chemical reactions needed to break down complex molecules into simpler compounds, releasing energy that the decomposers can use. Without oxygen, decomposition would be slower or may not occur at all.
Mitochondria in the cell use oxygen when breaking down glucose.
Enzymes
Dentrification is the anaerobic process (making energy without using oxygen) of breaking down nitrates into nitrogen gases.