The correct answer is: A. fermentation
Fermentation is a metabolic process that produces chemical changes in organic molecules without the use of oxygen. This type of anaerobic respiration occurs in many different types of organisms, including bacteria, yeast, and some plants.
Biogas is a gas produced by the breakdown of organic matter in the absence of oxygen. It is a mixture of methane, carbon dioxide, and other gases. Biogas can be used as a fuel for heating, cooking, and electricity generation.
The other options are incorrect because they do not describe the process of biogas production.
- Oxidation is a chemical reaction that involves the loss of electrons. It 288 448 288 448s170.8 0 213.4-11.5c23.5-6.3 42-24.2 48.3-47.8 11.4-42.9 11.4-132.3 11.4-132.3s0-89.4-11.4-132.3zm-317.5 213.5V175.2l142.7 81.2-142.7 81.2z"/> Subscribe on YouTube