Which of the following processes returns carbon to the atmosphere? a. transpiration b. photosynthesis c. cellular respiration d. evaporation

a. Transpiration
                    This process is responsible for loss of water from aerial parts of plants.

b. Photosynthesis
                               This process is responsible for use of oxygen, water and sunlight to prepare food (glucose).

c. Cellular respiration
                                    This process is involved in breakdown of glucose with help of oxygen, and the end products are CO₂ and energy.

d. Evaporation
                       It is a simple process related to conversion of water from liquid phase to vapours.

Conclusion
                     Thus it is concluded from above explanation that cellular respiration is responsible for returning carbon into atmosphere.