Ecosystem:
![Picture](/uploads/1/8/3/5/18354217/607046081.jpg?441)
shows ecosystem. Picture from: http://www.nps.gov/pete/forteachers/images/ecosystem.jpg
According to Dictionary.com an ecosystem is formed by the interaction of a community of organisms with their environment. In each ecosystem there's an energy flow and a food chain that works together. (for more information see Pyramids) All ecosystems have animals, plants, and insects, this is their natural habitat. so anytime you step outside you are in an ecosystem.