Physics
On a stationary sail boat, air is blown from a fan attached to the boat. The boat

moves in opposite direction in which the air is blown
moves in the same direction in which air blows
does not move
spins around

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Physics
The bats can fly in the dark because

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

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