Physics
Why is it difficult to breathe at higher altitudes?

Due to low air pressure
Due to high humidity
Due to ozone
Due to low temperature

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

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

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