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21 May, 19:55

A dog breathes out CO2 and a tree releases O2. How are the dog and the tree connected in the oxygen cycle?

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  1. 21 May, 20:14
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    A dog breathes in oxygen and then releases carbon dioxide when he exhales. Conversely, a tree gives off oxygen and takes in carbon dioxide. So the breath of the dog sustains the tree while the output of oxygen for the tree sustains the dog.
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