Final answer:
Cancer can be caused by lifestyle factors, environmental risk factors including pathogens, and genetic predisposition.
Explanation:
Lifestyle factors such as diet, tobacco use, reproductive and sexual behavior, and alcohol consumption are known to cause about 75% of all cancers.
Environmental risk factors, including certain pathogens like hepatitis viruses, exposure to radon and air pollution, as well as UV light, significantly increase the risk of various cancers.
Genetic predisposition can also play a role in certain types of cancer, along with factors like aging and heredity.
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