On an average a healthy human breaths _______ times per minute

Options

A. `12-20`
B. 720-960
C. `4-5`
D. 120-160

Answer

To answer the question "On an average a healthy human breathes _______ times per minute," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for the average number of breaths a healthy human takes per minute.

2. **Identify Normal Breathing Rate**: Research or recall the normal respiration rate for a healthy adult. The average range is typically accepted as between 12 to 20 breaths per minute.

3. **Consider Abnormal Rates**: Note that if the breathing rate is below 12 or above 20 breaths per minute, it is considered abnormal. This reinforces the standard range.

4. **Select the Correct Option**: Based on the information gathered, the correct answer to fill in the blank is "12 to 20".

5. **Final Answer**: Therefore, on average, a healthy human breathes **12 to 20** times per minute.