Is circulation slow? - No, it isn't, What does it go into your lungs when you breathe in? - Oxygen, What does it go back into the air when you breathe out? - Carbon dioxide, Does your body need carbon dioxide? - No, we don't need, How do you call tubes, which carry the blood with carbon dioxide? - Veins, Why do we need oxygen, or when do we need oxygen? - To breathe, to live, to stay healthy and strong, How many minutes does it take to breathe? - one minute, Why do we use lungs? - breathe or to live,
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