Second and final topic within Physical Geography Global Challenge unit: Ecosystems Selected topic focus: Marine Ecosystems Key questions: 1. What is a biome? 2. What is the global distribution of biomes? 3. What factors affect the global distribution of world biomes? 4. How does primary productivity differ in the major biomes?
An ecosystem is a community of plants and animals which interact with the environment and each other. The world is dependent on the goods and services that ecosystems provide. A biome is a global-scale ecosystem. There are eight main types of biome: