The answer to this question is 3
Answer:
identifying cells as foreign
Explanation:
An antigen is a toxin or other foreign substance which induces an immune response in the body, especially the production of antibodies. antigen can also be defined as a substance that binds to specific antibodies, which in the human body are used to find and neutralize any potentially harmful foreign substances in the bloodstream.
You should tell her that bones are more important than muscle and that muscle can't be anything without strong bones
