Answer:
Per my research, it was said that the higher the elevation, the more difficult breathing becomes. The air at higher altitudes is colder, less dense, and contains fewer oxygen molecules, which means that you would need to take more breaths in order to get the same amount of oxygen as you would at lower altitudes.
Step-by-step explanation:
Hope this helped and please correct me if I am wrong. I did my research and I think this is right because of the elevation. Have a good one!