Question

11. Whenever we feel drowsy or sleepy, we start yawning, why?​

Answer 1

Answer:

When we are sleepy or feel drowsy, we yawn because our brain cells lack sufficient amount of oxygen. The deep breath associated with yawning helps us to drawn in more oxygen and supply the much needed oxygen to the tired body organs including the brain..

Step-by-step explanation:

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Answer 2

Answer:

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