Biogas produced as a result of anaerobic decay of organic matter consist primarily of gases:

🧠 Explanation:

Biogas, produced by anaerobic decay of organic matter, primarily consists of methane and carbon dioxide, not listed in the options, making “None of these” correct. Used for energy, it’s generated from waste like manure, studied in environmental science. Biogas supports sustainable energy, reducing reliance on fossil fuels. Its composition drives applications in cooking or power generation, particularly in rural areas. Understanding biogas highlights its role in renewable energy, ensuring clarity in discussing sustainable practices and their environmental and economic benefits in modern energy systems.