Environmental Science
Of the gases listed below, which is not believed to be responsible for enhancing the earth's greenhouse effect?

Molecular oxygen (O2)
Carbon dioxide (CO2)
Methane (CH4)
Chlorofluorocarbons (CFCs)
Nitrous oxide (N2O)

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Environmental Science
The main reason why vegetables take longer to cook in boiling water at high altitudes is because:

There is less oxygen in the air at high altitude
The temperature of the boiling water decreases with increasing altitude
Saturation vapor pressure decreases with increasing altitude
Water boils at a higher temperature with higher altitude

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