My grandfather always keep the window open. why give reason
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because when you keep your window open then you get fresh air
the light of sun come in your room and it destroy germs
the light of sun come in your room and it destroy germs
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Because your grandfather is old and could not get proper oxygen.
So,he keeps window open to get fresh air and oxygen and also vitamin D
So,he keeps window open to get fresh air and oxygen and also vitamin D
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