With the help of a labelled diagram,show the carbon cycle in nature. Describe the two ways in which carbon dioxide is fixed in the environment.

(N/A) The carbon cycle in nature is depicted in the provided diagram.
The two primary ways in which carbon dioxide $(CO_2)$ is fixed in the environment are:
$(i)$ Photosynthesis: Green plants absorb atmospheric $CO_2$ and convert it into glucose $(C_6H_{12}O_6)$ in the presence of sunlight and chlorophyll.
$(ii)$ Formation of Carbonates: Many marine animals use carbonates dissolved in sea water to synthesize their shells and skeletons,thereby fixing carbon in a solid form.