Question

the concentration of carbon dioxide in the earths atmosphere is 0.04 percent 40 percent 0.004 percent 0.4 percent 4.0 percent question 4 1 pt which of the following is part of the gas - exchange portion of the human lung? pharynx larynx alveoli bronchi bronchioles

Explanation:

The concentration of carbon - dioxide in Earth's atmosphere is around 0.04 percent. In the human lung, the alveoli are the site of gas - exchange where oxygen and carbon - dioxide are exchanged between the air and the blood.

Answer:

1. 0.04 percent
2. Alveoli