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27 June, 07:12

When is your breathing likely to speed up?

A. When your white blood cells increase

B. When your cells need more energy

C. When your heart cells need more carbon dioxide

D. When your blood cells have too much oxygen

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Answers (1)
  1. 27 June, 07:29
    0
    our breathing likely to be speed of when our cells need more energy ... because at that time energy is required so our breathing speed up.
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