1. by: Sara

2.  Cancer can be caused by smoking, possibly the sun and cells copying their selves and making mistakes.

3.  Viruses and mutations causes genetic changes in cells destined to become cancer.  The nature of genetic damage, and the genes which are affected by it.  The consequences of the genetic changes on the biology of the cell, both in generating defining the properties of cancer.  Facilitating additional genetic events which is lead to the cause of cancer.

4.  This is mutations that cause genetic diseases. How DNA replication cells have to do with causing cancer

5. Carcinogen is something that helps cause cancer. Examples: tobacco smoke is a powerful carcinogen, also the sun could be one too if you sit in the sun to long you can get really burnt to wear it can turn into skin cancer.

6. 1. Your cells copy and sometimes makes mistakes. 2. It can be genetic too if you have a family member that had or has cancer there could be a slight chance you could have it to. 3. Your immune system can be the cause of cancer too. If you have HIV or AIDS, or even if you had a rare syndrome that affected your immune system. 4. And then there's your age some people will live to a point till we die of age or an illness but if we were to live long enough we would die of cancer cause the longer we live, we are more likely to gather genetic damage to start a cancer

9.  http://cancerhelp.cancerresearchuk.org/ about-cancer/causes- symptoms/causes/what-causes-cancer http://cancerhelp.cancerresearchuk.org/ about-cancer/causes- symptoms/causes/what-causes-cancer  http://www.news- medical.net/health/What-Causes- Cancer.aspx http://www.news- medical.net/health/What-Causes- Cancer.aspx  http://www.google.com/ http://www.google.com/