Question

Why do we find it difficult to breathe as we go​

Answer 1

Answer:

As we go up, the air column decreases. The density of air layers is more near the earth surface and is less at higher altitudes,that means less oxygen is available for breething and this makes breathing difficult at higher altitudes.

Answer 2

Answer:

as we go up the air column describe the density of air layer is more near the Earth's surface and is less at higher altitude that means less oxygen is available for breathing and this makes breathing difficult at higher altitude