Which of the following DOES NOT affect breathing rate?Question 15Answera.Humidityb.Exercisec.Anxietyd.Drugs

The factor that does not affect breathing rate among the options provided is humidity.

Here's a step-by-step explanation:

1. Humidity refers to the amount of water vapor in the air. While high humidity can make the air feel heavy and may make breathing feel more difficult, especially for individuals with respiratory conditions, it does not directly affect the rate of breathing.

2. Exercise, on the other hand, increases the demand for oxygen in the body, which in turn increases the breathing rate.

3. Anxiety can also affect the breathing rate. When a person is anxious, they may breathe more quickly as part of the body's "fight or flight" response.

4. Certain drugs, including stimulants and depressants, can also affect the breathing rate. Stimulants can increase the breathing rate, while depressants can slow it down.

So, the correct answer is a. Humidity.