Final answer:
The loss of any of the three identified subsystems (atmosphere, hydrosphere, or lithosphere) would have a catastrophic consequence on the biosphere.
Step-by-step explanation:
The Earth is made up of four identified subsystems: the atmosphere, hydrosphere, lithosphere, and biosphere. The biosphere includes all living organisms and their interactions with the other subsystems. If any of the three identified subsystems, such as the atmosphere, hydrosphere, or lithosphere, were lost, it would have a catastrophic consequence on the biosphere. This is because the biosphere relies on these subsystems for essential resources like air, water, and nutrients for its survival and functioning.