Physics
The sky appears blue because

All colours interfere to produce blue
It is actually blue
The atmosphere scatters blue colour more than the others
In white light, the blue component dominates

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

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