Discussion
Which physiological consequence follows from that reduction?
Answer: A
The composition of the air is unchanged, since the permanent gases are well mixed throughout the homosphere, but each constituent's partial pressure falls with the total. It is the reduced partial pressure of oxygen rather than any change in proportion that causes hypoxia. This is a clean illustration of the distinction between mixing ratio and partial pressure. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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