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

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

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Physics
The bats can fly in the dark because

They can see the objects in darkness
They generate ultrasonic sound waves
They have weak legs and are likely to be attacked by predators
They generate flashes of light

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