Physics
When a bottle of scent is kept open in a corner of a room its odour is felt in all parts of the room. This is due to the phenomenon of :

Diffusion
Evaporation
Vaporisation
Sublimation

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Physics
Hydro-electric power is a:

non-renewable natural resource
A mixture of renewable and non-renewable natural resource
Neither renewable nor non renewable resource
Renewable natural resource

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Physics
The bats can fly in the dark because

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

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