Environmental Science
Biogas is composed of

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

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Environmental Science
Fungi is/are

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

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