Which of the following BEST describes what alveoli are?A.They are the smallest tubes in the respiratory system.B.They have a small amount of surface area. C.They are found on the end of bronchioles.D.They are comprised of millions of cells.

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C

Unit Test

Which of the following BEST describes what alveoli are?A.They are the smallest tubes in the respiratory system.B.They have a small amount of surface area. C.They are found on the end of bronchioles.D.They are comprised of millions of cells.

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