The atmosphere provides the air that living organisms need for breathing. Which two spheres are interacting in this process?
Atmosphere-Biosphere
The atmosphere is the layer of gases surrounding the Earth that supplies the oxygen living organisms need to breathe, while the biosphere consists of all living organisms and the environments they inhabit.
Breathing is a direct interaction between these two spheres: living organisms in the biosphere draw oxygen from and release carbon dioxide into the atmosphere.
The lithosphere (solid Earth) and hydrosphere (water) are not directly involved in this particular exchange of breathable gases.
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