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Which problem represents the compare,difference unknown structure?
Immune System
A biological system consisting of specific cells and proteins that defend the body against infection, disease, and foreign substances.
Stress
A physical, mental, or emotional factor that causes bodily or mental tension and may be a factor in disease causation; a state of mental or emotional strain resulting from adverse or demanding circumstances.
Illness
A state of being in poor health, typically due to disease, infection, or other medical conditions affecting the body or mind.
Helper T-Cells
A type of white blood cell crucial for the immune system's response, supporting the activity of other immune cells in combating pathogens.
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