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Which of the following actions increases the volume of your lungs?

a. Gases move from areas of lower pressure.
a. The rib cage becomes smaller.
a. The diaphragm flattens and moves downward.
a. Air pressure increases inside the lungs.

User Ellesmera
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Answer:

the diaphragm flattens and moves downward.

Step-by-step explanation:

User Jaycyborg
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