Why is it harder to breathe when climbing up a high mountain?
• The air compresses the lungs.
• The air is thinner.
• The air pressure increases.
• The air has more moisture.
1 answer
The correct answer is: The air is thinner.
• The air compresses the lungs.
• The air is thinner.
• The air pressure increases.
• The air has more moisture.
1 answer