Which of the following is most likely to result in hypoxia (as opposed to anoxia)?

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Hypoxia is a condition where there is a decrease in the oxygen supply to the body tissues, but not complete absence (anoxia). Mountain climbing in the Himalayas increases the altitude and decreases air pressure, which results in decreased oxygen supply to the body tissues, leading to hypoxia. The other options may result in anoxia because they involve abrupt interruption of oxygen supply to the body tissues.

Which of the Following Is Most Likely to Result in Hypoxia