Environmental Science
The main reason(s) for warm summers in northern middle latitudes is that:

The days are longer
The sun is higher in the sky and we receive more direct solar radiation
Only (b) and (c) are correct
The earth is closer to the sun in summer
All of these

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Environmental Science
Biogas is composed of

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

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