Answers: 11. No Diagram attached12. Nasal Cavity13. Bronchioles and Lung capacity14. Larynx17. It blocks off the windpipe during eating, so that food is not accidentally inhaled. 18. The actual exchanges occur in the millions of alveoli in the lungs and the capillaries that encloses them.
Based on how the question is asked I would say 2 3 are main answers but # is a possible answer if a third option is required.
dont click on alot of them, they are unsecure and dont work
17 is the answer to your question
It is the letter c. because its not prescribed to chen.