You are presented with the question "Cells that divide uncontrollably may form an irregular what?" and the following answer choices: 
- Epidermis
 - massive damage
 - Veins and arteries.
 - permineralization
 - flow of electrons
 - mass of cells
 - illness
 - swamp vegetation

Now knowing that cells that divide uncontrollably may form a tumor, or abnormal mass of cells and abnormal cells are irregular in shape, choose the best answer.


 

      mass of cells   