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oxygen cycle

noun, Ecology
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.
Origin of oxygen cycle
1930-35 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for oxygen cycle
  • The use and reuse of oxygen is called the oxygen cycle.
  • The extreme depolarizing effect of the oxygen cycle must be taken into account.

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