Physics
Why do birds not have respiratory trouble at the time of flying at high altitude ?

They fly inactively
They have extra air sacs
Their lungs are very large
They use less oxygen

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Physics
Air moves from the region where the air ________

Humidity is low to the region where the humidity is high
Humidity is high to the region where the humidity is low
Pressure is high to the region where the pressure is low
Pressure is low to the region where the pressure is high

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Physics
The velocity of sound in air

Decreases with increase of temperature
Does not depend on temperature
Increases with decrease of temperature
Decreases with decrease of temperature

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