Question

what is atmosphere? why does it gets difficult to breathe at high altitudes? ​

Answer 1

At higher altitudes, the air becomes thinner hence the amount of oxygen is less. Hence, there is a decrease in atmospheric pressure as well as the oxygen content of the atmosphere resulting in a low partial pressure of oxygen than that of carbon dioxide resulting in difficulty in breathing.
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Answer 2

Answer:

• The blanket of air surrounded the Earth is called atmosphere.
• Its difficult to breathe in high altitudes because there is less oxygen present in that range of height