Question

The mountaineers carry oxygen with them because ______.

Options

• At an altitude of more than 5 km, there is no air.

• The amount of air available to a person is less than that available on the ground.

• The temperature of air is higher than that on the ground.

• The pressure of air is higher than that on the ground.

Answer 1

The mountaineers carry oxygen with them because the amount of air available to a person is less than that available on the ground.