Evaporation of sweat uses energy, and the energy comes from body heat, and energy is the body's fuel. Given these facts, what powers sweat among the following options:
- heat produced
 - The body's fuel
 - a gas in the air
 - hydration
 - When the water is hot
 - air cools
 - matter vibrating
 - Cooling vapors


 

  The body's fuel       