What can change the structure of DNA?
Mutations rays or beams Genes radiation DNA Smoking Microscope Chemicals
A B C D E F G H
DNA is made up of nucleotides.
Mutations can change the structure of DNA. 
What can change the structure of DNA? (A) Mutations (B) rays or beams (C) Genes (D) radiation (E) DNA (F) Smoking (G) Microscope (H) Chemicals