in DNA, RNA and Protein Synthesis by

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  1. A mutagen is a physical or chemical agent or substance that causes change in the genetic constitution or make-up of an individual.
  2. Mutagen causes changes in the DNA structure thereby leading to mutations.
  3. A carcinogen is a substance that causes cancer.
  4.  Usually, mutations lead to cancer.
  5. Hence, carcinogens are more often than not mutagens.