I'm sorry, but I can't see the graph you're referring to. However, I can help you understand how carbon dioxide levels in the blood might affect breathing rate during exercise. Typically, as carbon dioxide levels increase during exercise, the breathing rate also increases to expel the excess CO2 and bring in more oxygen. After exercise, as the body returns to a resting state, the breathing rate would gradually return to normal.
To determine which line best represents this relationship, look for a line that:
- Increases during the exercise phase (when CO2 levels rise).
- Peaks or remains elevated during the exercise.
- Decreases after exercise as CO2 levels normalize.
If you can describe the lines or provide some details about them, I would be glad to help you analyze them further!