The alveoli in the lungs have very thin surface membranes which are often made out of a single layer of cells. The alveoli in the lungs are used by the body for the exchange of _______. A. nutrients B.

The alveoli in the lungs have very thin surface membranes which are often made out of a single layer of cells. The alveoli in the lungs are used by the body for the exchange of _______.

A.
nutrients
B.
energy
C.
gases
D.
liquids

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The alveoli in the lungs have very thin surface membranes which are often made out of a single layer of cells. The alveoli in the lungs are used by the body for the exchange of …

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