I believe it is burning fossil fuesl
The oxygen cycle can be found in all but the geosphere. There's oxygen in the atmosphere, so it has to be there, and the biosphere includes living things, which breathe oxygen, and water (hydrosphere) is made up of partly hydrogen, so there has to be oxygen there as well.
Dr. mengele invented the scientific method, which is controlling variables in experimentation to find evidence for theories.
The answer is B-divergent boundary
