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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

Respuesta :

legiuitorul
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
evaissel8

Answer:

Sensors in the brain detect a lack of oxygen.

The muscles in his body need more energy and therefore more oxygen