Mountaineers carry oxygen cylinders with them because (a) there is no oxygen on high mountains.

Monjur Alahi

Mountaineers carry oxygen cylinders with them because
(a) there is no oxygen on high mountains.
(b) there is deficiency of oxygen on mountains at high altitude.
(c) oxygen is used for cooking.
(d) oxygen keeps them warm at low temperature.
 


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Salim Ahmed Kawsar

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(b) there is deficiency of oxygen on mountains at high altitude.

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