You are presented with the question "What is used to cool the body when it is hot?" and the following answer choices: 
- water vapor
 - element
 - salt and water.
 - heater
 - evaporation
 - fur and fat
 - aqueous solution
 - sheet

Now knowing that when the body is hot , sweat is produced to cool the body and sweat is released from sweat glands beneath the skin, and as it evaporates, the skin is cooled, choose the best answer.


 

     evaporation    