Fact 1: Evaporation of sweat uses energy, and the energy comes from body heat.

Fact 2: Because food contains energy.

Given the two facts above, answer the question "What requires food?" with the following options: 
- Evaporation of sweat
 - hydration of their cells
 - Most plants
 - Microscopic organisms
 - agriculture
 - to stay alive
 - female sex cells
 - plant life


 

 Evaporation of sweat        