An ecosystem is a living community of plant and animals sharing an environment with non-living elements such as climate and soil.
Ecosystems exist on a variety of scales. An example of a small scale ecosystem (micro) is a pond. A medium scale ecosystem (messo) could be a forest. The tropical rainforest is an example of a very large ecosystem (biome).
Sunlight is the main source of energy. This allows plants to convert energy by photosynthesis. This provides food for some animals, birds and fish. These are called Herbivores. The other animals eat the animals that have eaten the plants. These are Carnivores. This process is called the FOOD CHAIN.
The World has many different ecosystems. Each one has its own climate, soil, plants and animals. Very few ecosystems are natural today because of human activities. More ecosystems are under threat than ever before and need protecting.