Physics
The bats can fly in the dark because

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

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Physics
What is a compound microscope?

A microscope whose lenses are concave.
A microscope whose lenses are convex.
A microscope that has one lens.
A microscope that has two sets of lenses : an occular lens and an eyepiece.

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