It is ecosystem's ability to sustain or continue itself.
Ecosystem
The selfish nature of people to sustain on natural products have changed nature's ecosystem.
An Ecosystem is an environment or a culture within which the conditions or resources necessary for sustaining a number of organisms or species exist, which in turn, constitute and sustain the ecosystem in and of itsself.
Ecosystem. APEX :P
Terraforming is transforming a planet into one that is similar to Earth (so that an ecosystem in which humans can survive will sustain itself).
Because that is the only known ecosystem that is not dependent on the sun to sustain life.
Ecosystems remain stable when all their features are in balance. It needs to be able to sustain all the living things that rely on the ecosystem to survive and thrive.
When the environment is degraded, the wildlife living there will have to find another place to live. They would no longer be able to sustain themselves in the ecosystem.
sustain
An ecosystem is an entire area that can sustain life. Ecosystems come in many sizes. If you take a look around you, you will see how we are a part of an ecosystem and we interact with other living organisms to maintain our lives. We eat animals, and we raise animals and feed them also. You can have a complete ecosystem on an acre of land and be self sufficient. But you will be interacting with all sorts of living creatures that make your life possible, from microscopic life to the big fat cow you are going to butcher for dinner this month.
To make a complete ecosystem for anything to live independently is probably beyond most peoples ability and budget. I know it is beyond me and my finances to make anything so large that it could sustain the life of all the plants, crustacea, insects, birds and other creatures that are required to make a complete ecosystem. The best or nearest thing that most experienced aquarists can do is to set up a balanced aquarium. But that is not what you asked for.