The important part of that system is that it protects you from an, illness, or any other things. The Blood cells do their Job In order to protect you from an illness, virus. The immune system is a fighting system of blood. The immune system has a role: It protects you from harmful germs. It has a Function that is Unique in it’s Own Way. Explanation:
I would use how it affects you and how it can "harm" you but if you were me i would be a smart butt and write how it helps, but just put how it affects and gives you munchies
