Q:Answer the following question given this paragraph: The immune system protects the body from worms, germs, and other agents of harm. The immune system is like a medieval castle. The outside of the castle was protected by a moat and high stone walls. Inside the castle, soldiers were ready to fight off any invaders that managed to get through the outer defenses. Like a medieval castle, the immune system has a series of defenses. In fact, it has three lines of defense. Only pathogens that are able to get through all three lines of defense can harm the body. Q: What system protects the body from worms, germs, and other agents of harm? Choices: - digestion - hormones - lymph system - immune A:
A:
immune