Environmental Science
Biogas is composed of

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

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Environmental Science
Which one is true?

commensalism when none of the interacting populations affect each other
commensalism when the interaction is useful to both the populations
symbiosis when neither population affects each other
symbiosis when the interaction is useful to both the populations

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