What happines as you pull dam the ballow at the bottom of the mode

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What happines as you pull dam the ballow at the bottom of the mode
As you pull down the balloon at the bottom of the model, the lungs (represented by the balloons inside) expands as it fills with air.

Answers

2016-07-01T15:19:50+08:00
As you pull down the balloon at the bottom of the model, the lungs (represented by the balloons inside) expands as it fills with air.
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