Physics
The bats can fly in the dark because

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

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Physics
Solar eclipse will take place when

the sun is between the moon and the earth
the moon does not lie on the line joining the sun and the earth
the moon is between the sun and the earth
the earth is between the moon and the sun

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