Physics
At constant pressure, the volume of a fixed mass of a gas is directly proportional to its absolute temperature. It is the statement of

Gay-Lussac's Law
Charle's Law
Boyle's Law
Avogadro's Law

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Physics
The bats can fly in the dark because

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

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