(i) Conversion of $C{{O}_{2}}$ into glucose by green plants in the presence of sunlight by photosynthesis.
(ii) Usage of carbonates dissolved in the sea water by marine animals to make their shells.
(i) Conversion of $C{{O}_{2}}$ into glucose by green plants in the presence of sunlight by photosynthesis.
(ii) Usage of carbonates dissolved in the sea water by marine animals to make their shells.