Which of the following is not a way in which carbon gases are introduced into the atmosphere?
a. forest fires
b. respiration
c. photosynthesis
d. burning of fossil fuels
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Option C. photosynthesis

Explanation:

Photosynthesis is the process by which plants make there own food in the presence of sunlight by utilizing carbon-dioxide and water and produce energy in the form of glucose.

The photosynthesis process takes place in two sequential stages called light dependent reactions and light-independent reactions. In  light dependent reaction light energy is converted to energy and stored in the form of ATP and in  light-independent reactions ATP and NADPH, are utilised and produces carbohydrates from carbon dioxide.

In the Light-Independent Process, plants absorb carbon dioxide and addition of hydrogen takes place to form carbohydrates and the process called  carbon fixation.

Carbon dioxide combines with ribulose 1,5-biphosphate (RuBP) and each molecule gets break down to form two glycerate 3-phosphate (GP) molecules.

Hence, photosynthesis is the process in which carbon gases are introduced into the atmosphere while carbon gases are absorbed from atmosphere.