Question

15. Mountaineers carry oxygen cylinders with them because
O There is no oxygen on high mountains.
There is deficiency of oxygen on mountains at high altitude.
O Oxygen is used for cooking.
O Oxygen keeps them warm at low temperature.​

Answer 1

Answer:

a

Explanation:

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Answer 2

Explanation:

Mountaineers carry oxygen cylinder along with them because when they climb mountains, as altitude increase, the amount of oxygen level in the atmospheric air decreases as trees are not found at higher altitude.

As a result, mountaineers suffer from dizziness. It can also lead to hypoxia