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closed ecosystem

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noun Ecology.

a self-replenishing ecosystem in which life can be maintained without external factors or outside aid.

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Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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American Heritage

Cultural Dictionary

closed ecosystem definition

An ecosystem in which no materials can leave or enter but through which energy from external sources can flow.

Note: The Earth is a closed ecosystem.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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"Cat-lovers will no doubt point out that the elegance and dignity of cats are the consequence of their sojourn in the temples of the gods, where their attitudes and movements were regarded as divine prognostications. Be that as it may, it is obvious that the cat's wealth of expressions make it an ideal candidate for such a role. Unlike the dog, which either wags its tail or does not wag its tail, the cat possesses a wide range of means to convey its emotions: It arches its back, makes its fur stand on end, meows, rubs itself against furniture and against humans, purrs, lashes its tail, spits, and hisses. The priests of Bacht, therefore, had ample material for interpretation."

-Philippe Diolé

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