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

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

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Environmental Science
What is UNCED?

United Nations Conference on Education,
None of these
United Nations Conference on Environment and Development
United Nations Conference on Environmental Day

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