Environmental Science
The gas responsible for the greenhouse effect on Venus is:

Water vapor (H2O)
Ozone (O3)
Nitrogen (N2)
Carbon dioxide (CO2)
Oxygen (O2)

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Environmental Science
The north-facing side of a hill in a mountainous region in the US tends to:

Receive less sunlight during a year than the south-facing side
Have snow on the ground for a longer period of time in winter compared to the south-facing side
All of these
Be a better location for a ski run than the south-facing side
Grow a variety of trees that are typically observed at higher elevation

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