Final answer:
False. Many cells in our body are useful and important for our health. Not all cells are harmful.
Step-by-step explanation:
False. Not all cells are harmful. In fact, many cells in our body are very useful and important for our health. For example, immune system cells play a crucial role in recognizing and destroying cancerous cells. Additionally, different types of cells have specific functions in the body, such as epithelial cells protecting the body's surface, bone cells supporting and protecting the body, and blood cells carrying nutrients and oxygen.