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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“Was” is used for the indicative past tense of “to be,” and “were” is only used for the subjunctive past tense.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use closed ecosystem in a sentence

Cultural definitions for closed ecosystem

closed ecosystem

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

notes for closed ecosystem

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.