Question

Write True or False :
1. Diaphragm of lungs stretches
and relaxes during breathing.
2. Bronchitis is a muscle problem. .
3. During vigorous exercise demand of carbon dioxide increases.
4. Human being inhale oxygen gas.
5. Trachea is the wind pipe.
6. Lungs are the main organs of breathings.
7. Mucus is a wax like liquid in the lungs.​

Answer 1

Answer:

3.its is false because the reason is 4th point