The flow of carbon between inorganic and organic sources in the environment is best description of the carbon cycle as a whole. Thus, option B is correct.
It is the process in which carbon compounds are interchanged among the biosphere.
For example the elemental form of carbon such as diamond and graphite in a combined state are mostly found as carbonates and as carbon dioxide gas.
It act as a blanket over our earth, by balancing the energy and also absorb sun's long wave length radiation.
It also involve in plant photosynthesis, bioaccumulation of carbon occur in animal body by consuming plant material, after the death of the animal it can decomposed and carbon is released back into the atmosphere.
The carbon which is not released back will form fossil fuels.
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