Environmental Science
Biogas is composed of

methane, carbon dioxide, nitrogen and sulphur
methane, carbon dioxide, nitrogen and hydrogen
carbon dioxide, nitrogen and hydrogen
ethane, carbon dioxide, nitrogen and hydrogen

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Environmental Science
Fungi is/are

Eukaryotes single-celled and primitive multi-celled organisms
single-celled prokaryotes
heterotrophic eukaryotes
Phototrophic eukaryotes

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