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14 September, 17:28

8. Humans need oxygen to break down food in order to provide energy for cells. The oxygen needed for this process is delivered by an organ system called the A. respiratory system. B. lungs. C. digestive system. D. alveolus.

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  1. 14 September, 17:41
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    The answer is B. Lungs
  2. 14 September, 17:49
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    Answer: B

    Explanation: we use lungs to breathe, so we take oxygen by lungs.
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