Q:
      
      
         
            
The main constituent of biogas is
         
       
      
      
      
          
      
      
          Answer & Explanation
         Answer: B) Methane         
         
Explanation: The main constituent of biogas is methane (55-70%), CO2 (30-45%) and some traces of gases such as H2S and ammonia.
Biogas is produced under anaerobic conditions; the process is denominated as anaerobic digestion.
       
      
      
      
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