Answer:
Normal cells stop dividing when they come into contact with similar cells, while cancer cells do not.
Step-by-step explanation:
Cancerous tumors are characterized by cell division, which is no longer controlled as in normal tissue. "Normal" cells stop dividing when they come into contact with similar cells, a mechanism known as contact inhibition. Cancerous cells lose this ability.
In cancer cells, the self-regulation system that controls and limits cell division is unbalanced. The process of cell division, whether in normal or cancerous cells, is carried out through the cell cycle. The cell cycle goes from the resting phase, through the active growth phases, to mitosis (division).