Which natural process removes carbon dioxide from the air? a. nitrogen cycling
b. the water cycle
c. animal respiration
d. plant photosynthesis

Plants use carbon dioxide from the atmosphere for photosynthesis. The carbon becomes part of complex molecules in the plants, such as proteins, fats and carbohydrates.

D (plant photosynthesis)

Explanation:

Photosynthesis is a phenomenon unique to only autotophs like plants. Photosynthesis is the process whereby plants utilize the light energy from the sun to produce their own food in form of organic molecules (glucose).

Plants are able to carry out this process due to the possession of Chlorophyll pigments in their Chloroplast. This Chlorophyll molecule enables them to trap the energy from sunlight which they use to power the synthesis of glucose.

Since the food they produce is organic, they need a carbon source. Atmospheric carbondioxide (CO2) which enters the plant via their stomata is the carbon source plants make use of during the photosynthetic process. They combine CO2 and water (H2O) to produce glucose molecule. The overall equation is:

6C02 + 6H20 > C6H12O6 + 6O2

Therefore, the natural process that removes carbondioxide from the atmosphere is Photosynthesis can out by plants.