Why do mountaineers climbing high mountains carry oxygen cylinders with them?

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Solution

As one goes up from plains to mountains, the amount of oxygen present in the air decreases. On mountains, one cannot get enough oxygen through the normal breathing process. Thus, mountaineers need to carry oxygen cylinders with them to get continuous supply of oxygen.

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Statement I: Mountaineers carry oxygen cylinders with them while climbing high mountains.

Statement II: The percentage of oxygen in air decrease with increasing altitude.

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