Cancer

Cancer has always been part of our body. In our DNA, there are genes called proto-oncogenes. If these genes are mutated into oncogenes, they can activate cancer cells to reproduce.

Another cause of cancer is the malfunction of tumor suppressor gene. A tumor suppressor gene is a gene that protects a cell from one step on the path to cancer. When these genes mutate, they stop regulating the reproduction of cancer cells.

In order for cancer cells to reproduce, they need a large amount of ATPs. Usually, they absorb and suck those ATPs from other cells so that other cells stop reproducing and the body would slowly die out.