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9. 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

Explanation:

B.the diaphragm contacts and the rib cage expands.