The mountaineers carry oxygen with them because:
(a) At an altitude of more than 5 km there is no air.
(b) The amount of air available to a person is less than that available on the ground.
(c) The temperature of air is higher than that on the ground.
(d) The pressure of air is higher than that on the ground.
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Answer:
(b) The amount of air available to a person is less than that available on the ground.
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Answer:
c is the answer, according to my studies
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