Physics
An electron microscope gives higher magnification than an optical microscope, because :

It uses more powerful lenses
The electrons have more energy than the light particles
The velocity of electron is smaller than that of visible light
The wavelength of electrons is smaller as compared to the wavelength of visible light

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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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