The biosphere encompasses all living organisms and their physical environments on Earth, including:

* All ecosystems: From the deepest ocean trenches to the highest mountain peaks, every environment containing life is part of the biosphere.

* The atmosphere: The layer of gases surrounding the Earth, which provides oxygen and other essential elements for life.

* The hydrosphere: All the water on Earth, including oceans, lakes, rivers, and groundwater.

* The lithosphere: The Earth's solid, rocky outer layer, which provides a habitat for many organisms.

So, the biosphere is a vast, interconnected system that supports all life on Earth.