Physics
A drop of liquid assumes spherical shape because:

A sphere has the least surface area for a given volume
A sphere has the largest surface area for a given volume
Intermolecular forces are strong in liquids
Inter molecular forces are weak in liquids

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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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