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

Fact 2: Meat, fish and chicken are rich sources of protein.

Given the two facts above, answer the question "Meat, fish and chicken are used to do what by the human body?" with the following options: 
- energy
 - heat energy
 - destroy cells
 - Relieve pain
 - damage cells
 - survive
 - repair cells
 - break down cells


 

       repair cells  