You are presented with the question "Most carcinogens cause cancer by producing changes in what?" and the following answer choices: 
- harmful substances
 - Chlorophyll
 - the skin
 - the eyes
 - organs
 - layers of fat
 - DNA sequence
 - alleles

Now knowing that most carcinogens cause cancer by producing mutations in DNA and mutations are changes in the DNA sequence, choose the best answer.


 

       DNA sequence  