Physics
Air moves from the region where the air ________

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

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Physics
The bats can fly in the dark because

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

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