You are presented with the question "When cells start to divide uncontrollablly, they may form a what?" and the following answer choices: 
- anemia
 - tissue
 - fever
 - cell
 - organ
 - fibroid
 - acid rain
 - illness

Now knowing that cells that divide uncontrollably may form a tumor, or abnormal mass of cells and for example, a fibroid is a tumor, a wart is a tumor, and cancers are tumors, choose the best answer.


 

      fibroid   