AP BIOLOGY

Detailed explanation-1: -Any substance that causes cancer is known as a carcinogen. But simply because a substance has been designated as a carcinogen does not mean that the substance will necessarily cause cancer.

Detailed explanation-2: -Exposure to some chemicals and hazardous substances can increase the risk of cancer. A few well-known carcinogens are asbestos, nickel, cadmium, radon, vinyl chloride, benzidene, and benzene. These carcinogens may act alone or with another carcinogen to increase your risk.

Detailed explanation-3: -A carcinogen is a substance, organism or agent capable of causing cancer. Carcinogens may occur naturally in the environment (such as ultraviolet rays in sunlight and certain viruses) or may be generated by humans (such as automobile exhaust fumes and cigarette smoke).

Detailed explanation-4: -Six infectious agents have been shown to be carcinogenic primarily by inducing chronic inflam-mation. Those are the two hepatitis viruses, HBV and HCV, the bacterium Helicobacter pylori and, the three worms Schistosoma haematobium, Opistorchis viverrini, and Clonorchis sinensis.

Detailed explanation-5: -Abstract. Environmental carcinogens are physical, chemical and biological exogenous agents that cause cancer after having penetrated into the organism. Cancer is mostly a disease caused by chronic exposure to low dose carcinogens.