JEWS
Methanogens can be found in oxygen-starved environments such as swamps, marshes, and the digestive tracts of some animals. They are anaerobic microorganisms that produce methane as a byproduct of their metabolism in the absence of oxygen.
Obligate anaerobes
Burning (oxydation, reaction with oxygen) is possible only when oxygen exist.
An anaerobic microorganism.
it can produce energy in the presence and absence of oxygen unlike aerobic exercise which can only produce energy in the presence of oxygen
Anaerobic means to require an absence of free oxygen. In home-wine making, for instance, the anaerobic stage is when a fermenting wine is enclosed in a container with only a fermentation trap to allow the carbon dioxide to escape, but which also keeps out oxygen.
Aerobic enzymes function in the presence of oxygen to catalyze reactions involved in aerobic respiration, while anaerobic enzymes function in the absence of oxygen or low oxygen conditions. Aerobic enzymes support the breakdown of glucose to produce ATP efficiently through the electron transport chain, while anaerobic enzymes help produce ATP through processes like fermentation in the absence of oxygen.
Anaerobic Respiration occurs only in the absence of Oxygen.
oxygen is solely used by mitochondria in cells for energy, that is the only reason we need oxygen.
Basically Fermentation is an Anaerobic respiration (i.e. Oxidation of energy compounds in the absence of oxygen).That means the answer to your question is 'oxygen'.
Fermentation can occur in the absence of oxygen. This process allows for the production of energy in the form of ATP without the need for oxygen.
Possible products of respiration in the absence of oxygen are lactic acid, ethanol, and carbon dioxide. This process is known as anaerobic respiration and occurs in the absence of oxygen to produce energy.