An ecosystem is a community of interacting plants and animals considered within their physical environment. We can devide the world in regions of simular ecosystems. Those regions are:

• Boreal Evergreen Forests
• Mediterranean Woodlands
• Subtropical Deserts and Semi Deserts
• Temperate and Subtropical Evergreen Forests
• Temperate Decidious Forests
• Temperate Deserts and Semi-Deserts
• Temperate Grasslands
• Tropical Dry Forests and Savannahs
• Tropical Wet Forests
• Tundra, Polar Deserts and Ice
• Wetlands