Physics
If an empty cylinder is half filled with a liquid, its center of gravity is

Shifted downwards
Shifted upward or downward depending on the density of the liquid
Shifted upwards
Shifed neither upward nor downward

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Physics
The bats can fly in the dark because

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

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