A part of the earth where living things exist

Biosphere

Explanation:

The biosphere refers to the entirety of the ecosystems in the earth, and therefore represents all living things. The biosphere can also include the interaction of the ecosystems with other physical systems such as the geosphere and the hydrosphere.

The biosphere encapsulates all areas of the planet, from arid deserts to the north and south poles, all the way to the bottom of the ocean.