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Pronunciation varies by accent · noun
The portion of the atmosphere from sea-level to about 4000 meters in which it is possible to breathe without technological assistance..
Use ecosphere when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Ecosphere means The portion of the atmosphere from sea-level to about 4000 meters in which it is possible to breathe without technological assistance..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use ecosphere where its definition matches the intended context.
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