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Which of the following refers to breathing?

  1. -Phagia

  2. -pnea

  3. -itis

  4. -emia

The correct answer is: -pnea

"Breathing" refers to the physical act of inhaling and exhaling air. The term for this is "pnea," which is the option B in the question. Option A, phagia, refers to swallowing, not breathing. Option C, itis, refers to inflammation, not breathing. Option D, emia, refers to blood, not breathing. Therefore, only option B is the correct answer as it directly relates to breathing.