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26 May, 09:45

During gaseous exchange terrestrial mammals breathe in (A) air and breathe out carbon dioxide (B) oxygen and breathe out carbon dioxide (C) air with with a high concentration of oxygen and breathe out carbon dioxide (D) air with a high concentration of oxygen, and breathe out air with a high concentration of carbon dioxide

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  1. 26 May, 12:34
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    Answer: B

    Explanation:

    Gaseous exchange requires the organism to take in oxygen in exchange for the waste product of carbon dioxide. The air we breathe is not high concentration of oxygen.
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