Identify the correct option from the following about the proportion of different gases in Biogas?

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Q: 72 (CAPF/2024)
Identify the correct option from the following about the proportion of different gases in Biogas?

question_subject: 

Ecology

question_exam: 

CAPF

Biogas primarily consists of methane, followed by carbon dioxide. Trace amounts of other gases like nitrogen may also be present.