cexe1118 cexe1118

04-04-2018
Biology

contestada

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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cupofmice cupofmice

04-04-2018

answer = e. alveoli

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