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2 June, 12:20

John Likes hiking he observes that whenever he hikes up a hill he breathe heavier than when he is on flat ground which two statements explain why this happened

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  1. 2 June, 12:39
    0
    Sensors in the brain detect a lack of oxygen.

    The muscles in his body need more energy and therefore more oxygen
  2. 2 June, 15:39
    0
    Because when he hikes up a hill he does much more effort than when he walks in flat ground, also the heart beats faster in order to send blood to all his organism
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