Physics
The bats can fly in the dark because

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

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Physics
The blue colour of sky is due to

Scattering of shorter wavelengths of sunlight in the atmosphere
Scattering of longer wavelengths of sunlight in the atmosphere
Reflection of sunlight
Refraction of sunlight

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