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8 May, 05:38

The main function of the human respiratory system is to

Question 4 options:

A. Produce carbon dioxide as a waste product.

B. Obtain oxygen out of the atmosphere.

C. Remove nitrogenous waste from the blood

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Answers (1)
  1. 8 May, 09:04
    0
    B. Obtain oxygen out of the atmosphere.
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