Question

Jon likes hiking. He observes that whenever he hikes up a hill, he breathes heavier than when he is on flat ground. Which two statements explain why this happens?

Answer 1

When climbing a hill or mountain, there are different condions which the body reacts to, first: the body begins to exercise, since it must carry all our weight when climbing up a hill, this generates that the heart accelerates and pumps the blood more quickly so that it reaches our whole body out, and the second one, is that at a higher height, less oxygen, if already, our body comes with the heart shaken by the physical exercise, now it has to  accelerate your breathing to get the necessary oxygen for the blood and the body, these two things make us breathe heavily.

Answer 2

Answer:

       There are two answers that explain this question: Pressure and oxygen

Explanation:

        When someone lives in a place, it normally produces red blood cells onto a certain quantity, and this quantity is enough for the body at that place. But when Jon goes hiking up in a hill, there's less oxygen for him to breath, so he starts having problems to breath, and he feels it's heavier than before. The pressure too changes, not that much, but it does, and both of these combined, red blood cells are not produced as they should be, the body needs to adapt to a new environment, and that why that happens.