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The leaves of living, green plants, including the trees which are the forest, absorb Carbon Dioxide [CO2] from the air and use that in the growth process called photosynthesis. The Carbon is used by the plant in creating its food.

The Oxygen [O2] which was separated from the Carbon is "exhaled" through the leaves, into the surrounding atmopsphere, thus replenishing the O2 in the air.

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14y ago

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