Question

defination for oxygen cycle

Answer 1

Hey mate here is ur answer........

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.

the cycle whereby atmospheric oxygen is converted to carbon dioxide in animal respiration and regenerated by green plants in photosynthesis.

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Answer 2

the circulation or recycling of oxygen from animals to plants or plants to animals through earth atmosphere is known as oxygen cycle.

oxygen is 21%in our earth atmosphere.