Answer:
The true statement about cancer is:
a. Cancer is not a single cell disease, but many diseases that have some common characteristics
Step-by-step explanation:
Cancer is a complex group of diseases characterized by the abnormal and uncontrolled growth of cells. It is not caused by a single factor or a single event. There are various types of cancer, each with different causes, risk factors, and characteristics. While there are commonalities in how cancer develops and progresses, it is not a single disease but rather a group of diseases that share some common characteristics.