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Dictionary

ox'ygen cy"cle

Ecol.
the process by which oxygen released into the atmosphere by photosynthetic organisms is taken up by aerobic organisms while the carbon dioxide released as a by-product of repiration is taken up for photosynthesis.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

oxygenate

oxygen debt

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