Fact 1: Cells that divide uncontrollably may form a tumor, or abnormal mass of cells.

Fact 2: Cancer is a malignant tumor.

Given the two facts above, answer the question "Cells that divide uncontrollably may form what?" with the following options: 
- air
 - epidermal
 - fever
 - bacteria
 - cell phones
 - cancer
 - illness
 - water


 

      cancer   