Answer:
Immunity refers to the body's ability to prevent the invasion of pathogens
The purpose of the immune system is to protect the body from invasion from microorganisms.
The immune system has a vital role: It protects your body from harmful substances, germs and cell changes that could make you ill. It is made up of various organs, cells and proteins. As long as your immune system is running smoothly, you don't notice that it's there.
