The correct response is: The air is thinner.
As altitude increases, the air becomes less dense, resulting in fewer oxygen molecules available for breathing, making it harder to breathe at high elevations.
Why is it harder to breathe when climbing up a high mountain?(1 point) Responses The air is thinner. The air is thinner. The air compresses the lungs. The air compresses the lungs. The air has more moisture. The air has more moisture. The air pressure increases.
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