Two constituents of biogas are and .

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Detailed Solution

Concept- The two constituents of biogas are methane and carbon dioxide. Biogas is a mixture of gases liberated by the breakdown of organic matter in absence of oxygen.
Biogas is also sometimes called swamp gas, sewer gas, compost gas, and marsh gas. Biogas is a naturally occurring and renewable energy source produced by the decomposition of organic matter by certain bacteria under anaerobic conditions.
It is a mixture of 50-75 % methane (

), 25-50 % carbon dioxide (

) and trace amounts of gases like nitrogen, hydrogen and oxygen.
These gases combust with oxygen and the energy released on this combustion is used for different purposes such as cooking.
Hence, the answer is methane and carbon dioxide.

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