everything in the natural world is connected. An ecosystem is a community of living and non-living things that work together, Ecosystems have no particular size. An ecosystem can be as large as a desert or a lake or as small as tree or a puddle, If you have a terrarium, that is an artificial ecosystem. The water, water temperature, plants, animals plants will die. If ll work together. If there isn't enough light or water or if the soil doesnm have the right nutrients, the the plants die, animals that de animals that on the plants die, any animals that depend on those animals will die. systems in nalure work the same way All the parts work together to