GPP - RA = Net Basic Output (NPP) the volume of organic carbon that plants create and that isn't used up during respiration.
What is breathing? The life-sustaining process of respiration involves the exchange of gases between the body and the external atmosphere. In particular, oxygen travels from outside the air into in the body while waste gases like carbon dioxide, water vapor, and others travel from the body's interior to outside air.
When cells are respiring, carbon might or might not be present.. Though it appears that the body "respires" by taking oxygen (which functions as an electron donor) and expelling co2 from the atmosphere, the procedure is actually known as "respiration.
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