Physics
The bats can fly in the dark because

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

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Physics
Which of the following occurred first ?

Wright Brothers successfully flew an aircraft
Guglielmo Marconi sent out the first wireless signals
Albert Einstein propounded the General Theory of Relativity
Max Planck unveiled the Quantum Theory

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