Here's why:

* Biosphere: The biosphere encompasses all life on Earth, from the deepest ocean trenches to the highest mountain peaks. It's a global system where living organisms interact with each other and their environment.

* Biome: A biome is a large-scale ecosystem characterized by its climate, vegetation, and animal life. Examples include deserts, forests, grasslands, tundra, and aquatic biomes.

Essentially, biomes are the building blocks of the biosphere. Each biome represents a distinct life zone within the larger Earth system.

Therefore, every single biome contributes to the interconnectedness and complexity of the biosphere as a whole.