What term describes the area on Earth where all life exists?

The term that describes the area on Earth where all life exists is the biosphere. The biosphere encompasses all ecosystems and living organisms, including plants, animals, and microorganisms, in various environments such as land, water, and air. It is a crucial component of Earth's system, integrating all biological components and their interactions with the physical environment.

The atmosphere refers specifically to the layer of gases surrounding the Earth, the hydrosphere includes all water bodies and moisture, while the geosphere pertains to the Earth's solid parts, including rocks and landforms. While all these components are interconnected within the biosphere, they do not encompass life in the same holistic manner as the biosphere itself does.