Air moves into the lungs when
(a) the diaphragm contracts and flattens and the rib cage moves down and into the chest.
(b) the diaphragm contracts and flattens and the rib cage moves up and out from the chest.
(c) the diaphragm relaxes and the rib cage moves down and into the chest.
(d) the diaphragm relaxes and the rib cage moves up and out from the chest.
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