Fact 1: Protein is used to repair cells by the human body.

Fact 2: Proteins are essential to the structure and function of cells.

Given the two facts above, answer the question "cells need to be what regularly to function properly" with the following options: 
- growth
 - hydration
 - repaired
 - rest
 - frozen
 - plugged in
 - enlarged
 - staying warm


 

   repaired      