As you increase altitude in the atmospheric layers, what happens to the air pressure and oxygen levels? A. The both increase. B. The both decrease. C. No change; they stay the same.

Answer 1

B. They both decrease.

As you increase in altitude, both air pressure and the amount of oxygen available in the air decrease. This is because the density of the air diminishes with height, leading to lower pressure and a reduction in the concentration of oxygen molecules.