Here's why:

* Biome: A large-scale community of plants and animals that share a similar climate and have adapted to that environment. While biomes can be geographically separated, they are defined by their overall environmental conditions, not by direct interactions.

* Ecosystem: A community of living organisms (biotic) and their non-living environment (abiotic) interacting as a functional unit. Ecosystems can be nested within larger biomes.

Example:

* Tropical Rainforest Biome: This biome includes many different ecosystems, such as rainforests in South America, Africa, and Southeast Asia. These ecosystems are distinct but share similar characteristics like high rainfall, warm temperatures, and diverse plant and animal life.

Let me know if you'd like more information on biomes or ecosystems!