Definition of an Ecosystem
Self-sustaining community comprised of interdependent organisms (plants, insects, animals) and their natural environment. It provides the food chain through which energy flows, and the biological cycles that recycle essential nutrients and wastes
reference: http://www.businessdictionary.com/definition/ecosystem.html
Our Eco-column is self sustaining becuase it has survived the three week holiday and and the grass is still alive, there are fruit flies inhabiting the decomposition zone and there are still earthworms in our terra Zone. Our elodia in our aqua zone is still growing and has grown alot over the holidays.
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