Answer: this are no options on this question.Here are some facts about the carbon cycle-
It involves the circulation of the element carbon
It ensures that the element is constantly being reused.
Explanation:in nature, nutrients move through the biosphere.it involves movement from the environment eg the air,soil etc, to the organism in a cyclic matter.this cyclic movement ensures that the nutrients are not exhausted and are continually reused.examples of nutrients that undergoes such cycles are carbon, nitrogen etc.
Water too had it's cycle in nature.
In The carbon cycle, carbon dioxide is taken up by autotrophs to produce carbonhydrate. Then heterotrophs takes up the carbonhydrate found in plant .then carbon dioxide is given off and the plants takes up this carbon dioxide for photosynthesis and the process continues.
Carbon can be also returned to the atmosphere by combustion of wood and coal .