Why is it difficult to breathe at high altitudes?
Group of answer choices

Because you are closer to the sun the higher you go. loser to the sun the higher you go.

Because there is more carbon dioxide the higher you go

Because there is no oxygen in the troposphere.

Because atmospheric gases become thinner the higher you go. eric gases become thinner the higher you go.

c

Explanation:

air gets thinner the higher you go until there is no more oxygen

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