Answer:
A Mutation occurs when a DNA gene is damaged or changed in such a way as to alter the genetic message carried by that gene. A Mutagen is an agent of substance that can bring about a permanent alteration to the physical composition of a DNA gene such that the genetic message is changed.
Step-by-step explanation:
mutations can result from DNA copying mistakes made during cell division, exposure to Ionizing radiation, exposure to chemicals called mutates, or infections, by viruses
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