Fact 1: Mutations may change the structure of a chromosome or just change a single nucleotide. Fact 2: Mutagenic chemicals cause mutations. Given the two facts above, what may change the structure of a nucleotide?

Select from: (A). oxidation reaction (B). adding heat (C). Water (D). Name (E). Mutagenic chemicals (F). permineralization (G). Air (H). that material's properties
Answer:
(E).