Fact 1: Cells have multiple repair mechanisms to fix mutations in DNA.

Fact 2: And if the damaged DNA is duplicated, it causes mutation.

Given the two facts above, answer the question "Cells have multiple repair mechanisms to fix what?" with the following options: 
- a tree falling
 - direct damage to the lungs
 - that material's properties
 - damaged DNA duplication
 - an area swollen with pus
 - Veins and arteries.
 - the body's largest organ
 - The bending of a ray of light


 

    damaged DNA duplication     