Which gas is primarily produced by enteric fermentation and landfills?

• A. Ozone
• B. Methane
• C. Nitrous Oxide
• D. Carbon Dioxide

Answer: (B)

Gases produced through anaerobic processes dominate in both enteric fermentation and landfills. In the digestive systems of ruminant animals like cows and sheep, microbes produce methane as they break down plant material. In landfills, organic waste decomposes without oxygen, and methane is the main gas released by those microbial communities. Because both scenarios consistently yield methane as the primary product, methane is the gas described. Ozone is formed in the atmosphere rather than released directly from digestion or decomposition here, nitrous oxide mainly comes from soils and manure management, and carbon dioxide is released in many processes but does not stand out as the major product in these two contexts.