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Biology, 25.06.2019 15:50 djfluffyman999

When is your breathing likely to slow down?
a- when your heart cella’s need more carbon dioxide
b- when your heart rate slows down
c- when your blood cells have too much oxygen
d- when your heart rate speeds up

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When is your breathing likely to slow down?
a- when your heart cella’s need more carbon dioxi...

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