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On a very cold morning, Boojho and Paheli were talking with each other as they walked down to their school. They observed that the air coming out of their mouth looked like smoke. They were amused and wondered how it happened. Help them find the answer.
 
 
Reason
Answer variants:
On a cold day, warm,moist exhaled air becomes evaporated.
Because it comes in contact with hot atmospheric air.
Because it comes in contact with cold atmospheric air.
On a cold day, warm,moist exhaled air becomes condensed.