Naina B. answered 05/12/16
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Naina, a versatile tutor
Daisha,
It is photosynthesis, the process involves utilization atmospheric CO2 for food production by plants utilizing solar energy and their own chlorophyll.
During respiration plants exhale CO2 and inhale O2 just like animals and humans.
Combustion of wood would use atmospheric O2 and would release CO2 in the atmosphere. Plant decomposition would do the same.
Therefore, only photosynthesis would remove atmospheric CO2.
Hope this helps.