In the human respiratory system, gas exchange occurs across the cells of the ________. select one: a. trachea. bronchi c. diaphragm d. pharynx e. alveoli

In the human respiratory system, gas exchange occurs across the cells of the ________. select one:

a. trachea. bronchi
c. diaphragm
d. pharynx
e. alveoli

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In the human respiratory system, gas exchange occurs across the cells of the ________. select one: a. trachea. bronchi c. diaphragm d. pharynx e. alveoli

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