1 Cancer is a disease where cells do not follow the usual sequence of checkpoints or behaviors. A) Describe the NORMAL order of events that a cell encounters in its life cycle. Please be specific. B) What are the usual checkpoints that a cell would encounter in its cell cycle? (You should name 3) C) What happens normally if cells cannot pass the checkpoints? D) Why do cancer cells tend to pile on top of each other to form tumors? (What normal growth inhibitors are cancer cells