Question

define nitrogen cycle , oxygen cycle , carbon cycle.??

Answer 1

CNO cycle, in full carbon-nitrogen-oxygen cycle, sequence of thermonuclear reactions that provides most of the energy radiated by the hotter stars

Answer 2

Carbon cycle : the circulation and recycling of carbon from the atmosphere to living organism and after their death back to the atmosphere is called carbon cycle .

oxygen cycle : the circulation and recycling of oxygen within the biosphere is called the oxygen cycle.

nitrogen cycle: the circulation and recycling of nitrogen gas into the form of different compounds through various biotic and abiotic process in nature is called nitrogen cycle.

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