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25-06-2019
Biology

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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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Аноним Аноним

25-06-2019

Answer:

b- when your heart rate slows down

Explanation:

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