What part of the Earth do humans live on?  

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Humans live in the biosphere, anywhere on Earth that there is life. Life is found in various ecosystems.  Of course, the organisms in these ecosystems interact with the atmosphere, the hydrosphere and the lithosphere. Every part of the planet that supports life of some type is in the biosphere. There are Archaea that live under extreme conditions, life exists in the Polar regions, in deep sea vents and at the Equator. Life is found at high altitudes and in the deepest areas under the sea. In relation to the structure of the Earth which contains the outer crust, the mantle, the outer and inner cores, life is found at the lithosphere, which is the uppermost mantle together with the crust. Of course, life depends on the atmosphere and the hydrosphere for respiratory gases and water.

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