Environmental Science
Frost typically forms on the inside of a windowpane (rather than the outside) because:

The inside of the pane is colder than the outside
There is less water vapor touching the inside of the pane
There is more water vapor touching the inside of the pane
None of these

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Environmental Science
Biogas is composed of

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

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