Amutagen is 1: a living thing that has undergone a mutation. 2: an agent that causes a mutation in dna. 3: a mutation that has affected one gene. 4: a chemical that can poison living cells.

The answer would be 2. An agent that causes a mutation in DNA.

A mutagen is any agent capable of altering the genetic constitution of a cell by changing the structure of DNA.

Many forms of electromagnetic radiation such as cosmic rays, X rays, ultraviolet light and a variety of chemical compounds are mutagenic.

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