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Which best describes the function of a diaphragm?
A) The diaphragm is the site where oxygen enters the capillaries.
B) The diaphragm regulates air pressure inside the chest.
C) The diaphragm receives air, food, and liquids from the mouth.
D) The diaphragm vibrates when air passes through causing sound.
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Which best describes the function of a diaphragm?
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