How is CO2 fixed in atmosphere?
For the answer of your question you may refer to the study material (carbon cycle) on our website at the following link, if you have any doubts then get back to us
It is fixed in many ways:
By buerning the fossil fuels
By volcanic erruptnz
Humans they produce carbondioxide as a product of respiratn to d atmosphere
By the weathring of the carbon containg rockz by microrganismz
By decomposotion of the dead organic matter by the d action of microbes
Hope this much helpz!!!