It helps us understand people from different times and places.
Answer:
D
Explanation:
10 point ples
These outward and inward forces compete to inflate and deflate the lung with every breath. ... a directional respiratory system that allows them to obtain oxygen at high ... oxygen, even at higher altitudes where the oxygen concentration is low. ... into and out of the alveoli, which prevents carbon dioxide buildup in the alveoli.
Just smile and AH yall...
I think the correct answer would be C
