You are presented with the question "What divide more often than normal cells, and grow out of control?" and the following answer choices: 
- white blood cells
 - Most plants
 - hair cells
 - skin cells
 - Smoking
 - peachleaf willow
 - mutated cells
 - cigarettes

Now knowing that cancer cells divide more often than normal cells, and grow out of control and cancer is an example of a mutation in cells, choose the best answer.


 

       mutated cells  