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closed ecosystem

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noun Ecology.
  1. 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 Unabridged Dictionary, © Random House, Inc. 2018

closed ecosystem in Culture

closed ecosystem

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

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The Earth is a closed ecosystem.
The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.