Physics
Conservation of energy refers to the fact that

Energy cannot be created or destroyed but can be converted from one form to another
If you conserve energy you will not be as tired
The entropy of the universe is always increasing
No chemical reaction is 100 percent efficient

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Physics
The bats can fly in the dark because

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

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