Physics
The bats can fly in the dark because

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

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Physics
What is a compound microscope?

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

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