Which best describes carbon dioxide’s path out of the body?
nose → pharynx → larynx → trachea → bronchus → alveoli
alveoli → trachea → bronchus → larynx → pharynx → nose
alveoli → bronchus → trachea → larynx → pharynx → nose
nose → larynx → pharynx → trachea → bronchus → alveoli

To exit it would be aveoli, bronchus, trachea, larynx, pharynx, nose, to enter is the opposite.

alveoli → bronchus → trachea → larynx → pharynx → nose

Blood capillaries carries the carbon dioxide from the entire body to the alveoli, these alveoli get combine to form bronchus. Both alveoli and bonchus are present in the lungs. The air containing carbon dioxide then flows through the trachea and then through larynx and pharynx and lastly, exhaled out from nasal cavity of nose.

the index of refraction of the second medium is higher. i just took the test trust me !