All cancer is caused by _____ cell division. This would not cause any problems in a system with unlimited resources, but instead our bodies are an _____ system, which means that our homeostasis is highly _____. Most mutations to DNA occurs during _____. Because of this fact, our body's own immune can sometimes cause cancer. In class we discussed that _____ can become lodged in a person's lung by breathing in the tiny particles. The body responds by increasing _____ and inflammation to form a bubble around the invading particle. Natural mutations during the increased cell division accrue that can lead to cancer.