The PO₂ decreases with increasing altitude because of the A) lower percent of oxygen in the air. B) lower barometric pressure. C) higher percent of carbon dioxide in the air. D) higher percent of nitrogen in the air.

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The PO₂ decreases with increasing altitude because of the lower barometric pressure. As altitude increases, there is less air above which translates to less weight pressing down on a surface. This leads to a decrease in atmospheric pressure, which is commonly referred to as barometric pressure.

The PO2 Decreases with Increasing Altitude Because of the

The PO₂ Decreases with Increasing Altitude Because of the