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The biosphere is divided into the Northern hemisphere and the Southern Hemisphere. The two hemispheres are divided by a horizontal tropic called the equator.

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Q: What are the upper and lower boundaries of the biosphere?
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Where do all livings things on earth exist?

In the biosphere: the thin upper layer of the earth's crust, earth's waters, and the lower part of earth's atmosphere.


What is the meaning of lower class boundary in statistics?

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