closed ecological system
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closed ecological system[¦klōzd ek·ə′läj·ə·kəl ‚sis·təm]
A system used in spacecraft that provides for the maintenance of life in an isolated living chamber through complete reutilization of the material available, in particular, by means of a cycle wherein exhaled carbon dioxide, urine, and other waste matter are converted chemically or by photosynthesis into oxygen, water, and food.
A community into which a new species cannot enter due to crowding and competition.