Humans often have difficulty breathing at high elevations primarily because the _______ than it is at low elevations.

Name: Humans often have difficulty breathing at high elevations primarily because the _______ than it is at low elevations.
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Question

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At high elevations, the atmospheric pressure decreases, which results in a decrease in the partial pressure of oxygen (O2). This decrease in the amount of O2 available in each breath can make it difficult for humans to breathe.

Humans Often Have Difficulty Breathing at High Elevations Primarily Because