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Which of the following protects our body against disease-causing pathogens?

  • A.Respiratory system
  • B.Immune system
  • C.Digestive system
  • D.Excretory system

Answer: B

Correct answer: Immune system

The immune system is what defends against pathogens - barriers, phagocytes, complement, and the lymphocytes and antibodies of the acquired response. The respiratory, digestive and excretory systems serve gas exchange, nutrition and waste removal respectively.

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