Final answer:
The immune system protects the body against harmful pathogens by mounting a defense to neutralize and eliminate them.
Step-by-step explanation:
The immune system protects the body against changes caused by harmful pathogens. Pathogens are disease-causing microorganisms like bacteria, viruses, and fungi. When these pathogens enter the body, the immune system recognizes them as foreign invaders and mounts a defense to neutralize and eliminate them. This includes the production of antibodies, activation of immune cells, and the release of chemicals to destroy the pathogens.
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