Humans Have Difficulty Obtaining Enough Oxygen While Breathing at High

question 68

Multiple Choice

Humans have difficulty obtaining enough oxygen while breathing at high elevations because _______ at low elevations.

• A) CO₂ makes up a higher percentage of the air than it does
• B) the temperature is lower than it is
• C) the barometric pressure is higher than it is
• D) the air is drier than it is
• E) the partial pressure of O₂ is lower than it is

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