A. because of low oxygen content in the air at high altitudes
B. because of ratified air which puts strain on lungs to supply enough oxygen to the blood
C. because at high altitude air cause asthma and lung infection
D. none of the above
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A. because of low oxygen content in the air at high altitudes
B. because of ratified air which puts strain on lungs to supply enough oxygen to the blood
C. because at high altitude air cause asthma and lung infection
D. none of the above
Answer: D. None of the above.
Answer: D. None of the above.
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