Concept: The biosphere is the zone on Earth where living organisms exist and carry out life activities.
Explanation: The biosphere includes parts of the lithosphere, hydrosphere, and atmosphere where life is supported.
It is the global ecological system that contains all living things and their environments.
The lithosphere is only the solid outer layer of the Earth, not the life-supporting zone.
A habitat is the specific local home of an organism, while an ecosystem is a community of organisms and their physical surroundings.
Therefore, the entire area around the Earth where life activities occur is correctly called the biosphere.
Answer: Biosphere