On an average, an adult human being at rest breathes 15-18 times per minute. The breathing rate, however, may differ under different conditions. Arrange the following activities given in the box in order of increasing breathing rates and given reason for your answer.
sleeping, cycling, brisk walk, watching T.V

Explanation

To arrange the activities in order of increasing breathing rates, we need to consider how each activity affects our body's demand for oxygen. Here’s the step-by-step solution:

### Step-by-Step Solution:

1. **Identify the Activities**: The activities given are sleeping, watching TV, brisk walking, and cycling.

2. **Understand Breathing Rates at Rest**: An adult human being at rest breathes approximately 15-18 times per minute. This is our baseline for comparison.

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