Question

Why is it harder to breathe when climbing up a high mountain?(1 point)
Responses

The air compresses the lungs.
The air compresses the lungs.

The air has more moisture.
The air has more moisture.

The air is thinner.
The air is thinner.

The air pressure increases.

Answers

GPT-4o mini
The correct response is:

**The air is thinner.**

As altitude increases, the density of air decreases, which means there are fewer oxygen molecules available to breathe. This is why it becomes harder to breathe when climbing up a high mountain.