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1. The respiratory system's main job is to move fresh air into your body while removing waste gases.
2. the lungs
3. When you inhale through your nose or mouth, air travels down the pharynx (back of the throat), passes through your larynx (voice box) and into your trachea (windpipe).
4. The alveoli are where the lungs and the blood exchange oxygen and carbon dioxide during the process of breathing in and breathing out.
5. I don't know what that means
6. I don't what vices mean
7. I don't know po sorry
8. Family history and genes. Overweight and obesity tend to run in families, suggesting that genes may play a role.