You are presented with the quiz "What wets the skin, and when it evaporates, it cools the body?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "sweat wets the skin, and when it evaporates, it cools the body" and "perspiration There are about 2 million sweat glands in the average human body". 

So, what's the best answer to the question?


 

       Perspiration    