Yawning in a class with closed door usually takes place because:
Biology · NEET · NTA Exams — Breathing and Exchange of Gases
Yawning in a class with closed door usually takes place because:
- the teacher is explaining a boring topic
- increase of carbon-dioxide levels in the blood
- decrease in oxygen in the air within the class hall
- the student has not slept properly the last night
Answer
(B) increase of carbon-dioxide levels in the blood
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