Respuesta :

abigail3058

Answer:

Cancer is caused by accumulated damage to genes. Such changes may be due to chance or to exposure to a cancer causing substance. The substances that cause cancer are called carcinogens. A carcinogen may be a chemical substance, such as certain molecules in tobacco smoke.

Explanation:

camilla1657

Answer:

* smoking

* tobacco

*sun

* obesity

* lack of excercise

* chronic inflamation

*viruses  

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