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

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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