Across
- 1. / A gas that you breath out. it is a waste.
- 3. / Inhale and exhale
- 7. / Main organ of respiratory system
Down
- 2. / What we breath
- 4. / Prevents the entry of food to the trachea that leads to the lung
- 5. / Breath out.
- 6. / A tube that leads to the lungs.