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What happens when you breathe in air?

A. the diaphragm expands and the rib cage collapse.
B. the diaphragm contracts and the rib cage expands.
C. the diaphragm expands and the rib cage contracts
D. the diaphragm contracts and the rib cage remain the same


Sagot :

Answer:

B.the diaphragm contracts and the rib cage expands

Explanation:

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