Except for the skin,other physical barriers that also help to prevent the entry of microorganisms are:
$I.$ Mucus coating of the epithelium lining the respiratory tract
$II.$ Gastrointestinal tract
$III.$ Urogenital tract
Choose the correct option.

  • A
    $I$ and $II$
  • B
    $I$ and $III$
  • C
    $II$ and $III$
  • D
    $I, II,$ and $III$

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