Science, asked by priyanshutirkey195, 11 months ago

What causes yawning?

Answers

Answered by neelabhrohillauk

Hey mate here is your answer....
When the oxygen content in the brain is less then our brain to take in more oxygen causes yawning....

Answered by Anonymous

when we get extremely bored, restless, ,tension so we felt sleepy it cause us to yawn. it is scientifically proven.
Hope It Help You.
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