Hi! Have a look at this answer.
The carbon cycle is actually the biogeochemical cycle, which
involves the movement of carbon between oceans, atmosphere, geosphere and
biosphere. The point to be carefully noted is all living things are made up of
carbon, which can be found in different forms like carbon dioxide. The plant
absorbs carbon dioxide in the day and release it during the night due to the
process of photosynthesis. When plants die, the remaining stuff gets converted
into carbon, which cause animal’s death when they eats those plants. Moreover,
when animals dies, that carbon release back to the atmosphere that can be use
by the plants and this cycle goes on.
It helps in the movement of carbon through all the spheres of earth and to maintain concentrations in each sphere.