Crossword puzzle clue "natural life support system"

Here are the possible solutions for natural life support system clue

Answer
Clue
Relevancy
roots
Clue
Natural life support system
userinterface
Clue
System-to-system system
cerealaisle
Clue
Life-support system?
ecosphere
Clue
Life-support system?
Life-support system
Definition
the biosphere
roy
Clue
The natural in "The Natural"
biota
Clue
Natural life of a region
Definition
(Greek) the flora and fauna of a region
nomogeny
Clue
Natural origin of life
Definition
natural rather than religious account of the origin of life

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