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Class 11BiologyBreathing and Exchange of GasesHuman Respiratory System
Medium

$A$ pair of external nostrils present in humans opens out

  • A
    Below the upper lips
  • B
    Above the upper lips
  • C
    Between upper and lower lips
  • D
    Above the larynx
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Class 11 Questions

Class 11

Biology Questions

Chapter

Breathing and Exchange of Gases

Subtopic

Human Respiratory System

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