Physics
The bats can fly in the dark because

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

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Physics
Planets do not twinkle because

They are nearer to earth and hence we receive a greater amount of light.
They emit light of a constant intensity
They are very far away from the earth resulting in decrease in intensity of light
Their distance from the earth does not change with time

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