Physics
Water boils at a lower temperature on the hills because

There is less carbon dioxide on the hills
There is a decrease in air pressure on the hills
There is less oxygen
It is cold on the hills

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Physics
Why does bleeding occur through the nose in high mountainous regions ?

The blood pressure of a person increases at high altitudes
The pressure at high altitudes is greater than that on the plains
The blood pressure fluctuates and finally decreases drastically
The pressure of blood in capillaries is greater than the outside pressure

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