The part of the planet inhabited by living things is called the biosphere.

Here's a little more about it:

* Biosphere: This encompasses all living organisms and their environments on Earth. It includes the atmosphere (air), the hydrosphere (water), and the lithosphere (Earth's crust).

* It's a complex system: The biosphere is interconnected, with organisms constantly interacting with their surroundings.

* Life exists in various environments: The biosphere includes everything from the deepest ocean trenches to the highest mountain peaks.

Let me know if you have more questions about the biosphere!