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What is the main focus of a short story?
In what form did the short story exist in ancient communities?
When did the modern short story develop?
What is the main function of the immune system?
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What are antigens?
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Why is it important for the immune system to recognize and neutralize harmful substances?
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How do new germs make you ill when your immune system is weak or unable to fight them?
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What is the role of the immune system in the body?
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How does the immune system respond when it encounters antigens?
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Why is it important for the immune system to recognize and neutralize harmful substances from the environment?
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What activates the immune system to recognize non-self substances?
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