Question

why we yawning.reason

Answer 1

Answer:

Yawning is a mostly involuntary process of opening the mouth and breathing in deeply, filling the lungs with air. It's a very natural response to being tired. In fact, yawning is usually triggered by sleepiness or fatigue.

Explanation:

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Answer 2

Answer:

we yawn when we feel bored, tired or sleepy.

Explanation:

we don't breathe as deeply as we usually do. As this theory goes, our bodies take in less oxygen because our breathing has slowed. Therefore, yawning helps us bring more oxygen into the blood and move more carbon dioxide out of the blood.