Environmental Science
Biogas is composed of

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

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Environmental Science
Fungi is/are

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

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