by 
Anonymous
ANSWERS: 4
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Fashion accessory!
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i'm sure someone else knows more about this, but something to do with the air being thinner at high altitudes.. i think
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There is less oxogen in higher altitudes .
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At that height the air is so thin the body wouldn't get enough oxygen to survive. Only the last leg at the top is when it is used. "Altitude sickness" is the body's inability to adapt to the severe changes in air density one experiences during a high rate of climb. Because Everest is so high (even it's base is at high altitude) climbers live at its base for as much as a month before ascending, allowing for thier bodies to get accustomed to the much lower density of air (thus less oxygen per breath). If a climber was to ascend the mountain too quickly he would be overcome by the inability to process the ever-thinning oxygen supply in the air. Hemmoraging of organs such as the eyes and brains would cause bleeding and possibly death if not treated. Four days from bottom to top is the normal rate of climb to be safe and allow your body to adjust to the oxygen issue.
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