Physics
Sun appears red in colour at sunrise and sunset due to

That all other colours scatter away except red
The fact that sun emits only red colour at that time
That sun comes out of the mountains
Red light having longer wave length scatters away

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Physics
The bats can fly in the dark because

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

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