Environmental Science
Biogas is composed of

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

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Environmental Science
Definition of ecosystem is

The abiotic component of a habitat
The part of the earth and its atmosphere which inhibits living organisms
The community of organisms together with the environment in which they live
A community of organisms interacting with one another

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