When the immune system attacks itself.
Answer:
environment
is there things we see or feel that's around us it's called the environment environment is made up of a lot of things like examples I may sayanimals plants human beings electronic gadgets and so on and so forth
Marco-elements are needed by the body in large amounts in order to maintain
good health
blood vessels dilate, swelling occurs, phagocytes ingest foreign bacteria or viruses.
