What happens to air pressure and the amount of oxygen as the altitude increases in Earth’s atmosphere? What’s the answer

Answer 1

As altitude increases in Earth's atmosphere, air pressure decreases and the amount of oxygen also decreases. This is because as you ascend higher into the atmosphere, there are fewer air molecules, resulting in lower pressure and less oxygen available for breathing. This is why it becomes more difficult to breathe at higher altitudes and why people may experience symptoms of altitude sickness.