A biome is a large area with specific types of flora, fauna, and microorganisms, and which may contain many ecosystems. A biome can be thought of as many similar ecosystems throughout the world that share certain similarities. In contrast, an ecosystem is simply a functional unit of organisms, which typically include producers, consumers, and decomposers. The ecosystem can be as small as a rotting log, pond, field, or forest.
- Biome Wikipedia
- Coral reefs