Why is the immune system essential for our health?

  • A
    It helps in digestion of food.
  • B
    It acts as a defense mechanism against pathogenic microbes.
  • C
    It regulates the body temperature.
  • D
    It helps in the circulation of blood.

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$(a)$ What are the two ways by which an infectious disease can be treated?
$(b)$ Explain the mode of action of antibiotics.

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