Short answer VIII — task. Science CBSE, Class 7.

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Whenever we feel drowsy or sleepy, we start yawning. Does yawning help us in any way? Choose all possible answers.

While drowsy, breathing rate decreases.
Yawning brings extra carbondioxide into the lungs.
While drowsy, breathing rate increases.
Yawning brings extra oxygen into the lungs.
Yawning removes extra carbondioxide into the lungs.

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