Carbon cycle is process that shows the exchnge of carbon in the living and atmospheric system. Carbon cycle starts with the giving off of carbon dioxide from nimals, accumulation of co2 of plants, contribution of organic matter of dead animals and plants, photosynthesis, etc. The answer is D. fermentation
The carbon cycle can be defined as the process by which carbon is circulated on the earth. The carbon is taken by the plants and then it is transferred from the plants to the animals.They respire the carbon dioxide back into the atmosphere.
When the animals die the decomposers breakdown the nutrients and makes it available for the plants to consume it.
