What are ecosystems?
An ecosystem is a community of plants and animals and the environment in which they live. Ecosystems contain both living (biotic) and non-living (abiotic) parts. The living parts includes such things as plants, insects and birds which depend on each pther for food. Plants may also depend on insects and birds for pollination and seed dispersal. The non-living part of an ecosystem includes such things as the climate, soils and rocks, This non-living environment provides nutrients, warmth, water and shelter for the living parts of the ecosystem.
The global distribution pattern of biomes
Climate is such an important factor in influencing the natural vegetation and wildlife of a region that biomes (the largest-scale ecosystems) broadly match the world's climate zones.