U.S. National Library of Medicine
Ecological Systems, Closed
Systems that provide for the maintenance of life in an isolated living chamber through 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. (NASA Thesaurus, 1988)
The numerical value of ecological systems, closed in Chaldean Numerology is: 3
The numerical value of ecological systems, closed in Pythagorean Numerology is: 8
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"ecological systems, closed." Definitions.net. STANDS4 LLC, 2018. Web. 23 Feb. 2018. <https://www.definitions.net/definition/ecological systems, closed>.