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
If a glass of water were surrounded by saturated air:

The level of the water in the glass would not change
The water's temperature would slowly increase
The level of the water in the glass would slowly decrease
The water's temperature would slowly decrease

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