Define carcinogens. Describe the different classes of carcinogens.

Carcinogens are substances that have the potential to cause cancer, a disease characterized by the uncontrolled growth and division of abnormal cells in the body. These substances can initiate and promote the development of cancer by damaging the genetic material (DNA) within cells or by altering the regulatory mechanisms that control cell growth and division. The term "carcinogen" is derived from the Greek words "carcinos," meaning crab, and "genes," meaning born of, suggesting the crab-like spreading growth of cancer cells.

Carcinogens can be classified into different categories based on their mode of action, chemical properties, and the strength of the evidence supporting their carcinogenicity. The International Agency ____ ______ ________ _________ ____ ___ _____.
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