Carbon cycle is the continuous movement of carbon between the biotic and abiotic factors of the earth.
Oxygen is taken by humans and animals during respiration and carbon di oxide is given out which plants utilize for making their food.After the food making process, oxygen is released and plants utilize oxygen and release co2 ... this cycle goes on ...
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The atmospheric carbondioxide is converted in to glucose in the presence of sunlight through photosynthesis by plants.then,the glucose molecules are converted into other biologicaly important molecules.also,many marine animals use carbonates dossolved in sea water to make shells or exoskeleton.
the amount of CO2 is added to the atmosphere by the process of combustion where fuels are burnt to provide energy for various need. like this the C cycle is repeated through physical and biological activities.
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