Environmental Science
The gas that shows the most variation from place to place and from time to time in the lower atmosphere:

Methane (CH4)
Water vapour (H2O)
Ozone (O3)
Argon (Ar)
Carbon dioxide (CO2)

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Environmental Science
Our seasons are caused by:

The changing distance between the earth and the sun
Only (b) and (c) are correct
All of these
The angle at which sunlight reaches the earth
The length of the daylight hours

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