Why is it hard to breathe when climbing up a

Why is it hard to breathe when climbing up a high mountainThe air has more moisture The air compressor is the lungs The air is
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Why is it harder to breathe when climbing up behind mountain
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Why is it harder to breathe while climbing up a high mountain?
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Why is harder to breathe when climbing up a high mountain?
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why is it harder to breathe when climbing up a high mountain
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Why is it harder to breathe when climbing up a high mountain?
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2. asked by sebastian chapa
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Why is it harder to breathe when climbing up high mountain
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Why is it harder to breathe when climbing up a high mountain
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Why is it harder to breathe when climbing up a high mountain?(1 point)
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2. asked by Anonymous
3. 509 views
Why is it harder to breathe when climbing up a high mountain?(1 point)
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