Fact 1: Most carcinogens cause cancer by producing mutations in DNA.

Fact 2: If it causes changes in DNA, it is considered a mutagen, or potential carcinogen.

Given the two facts above, answer the question "What cause mutations in DNA?" with the following options: 
- Pesticides
 - smoking
 - chromosomes
 - protein
 - cigarettes
 - mutagens
 - amino acids
 - animals


 

      mutagens   