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oxygen cycle

noun, Ecology.
1.
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
1930-1935
First recorded in 1930-35
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Word Value for oxygen

17
18
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