The correct answer to your question is asthma attack:
- The asthma attack is triggered by respiratory tract infections like flu or pneumonia.
- The asthma attack is also triggered by cold due to the decrease in the diameter of bronchi.
- Emotional stress is well known to cause an asthma attack.
Pneumonia is triggered by cold and respiratory tract infections but the emotional stress factor is not being proved yet.
Answer:
independent variable
Explanation:
control is what stays the same and dependent is the results from the changes made not sure if im 100% correct
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