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For more on marking an answer as the "Best Answer", please visit our FAQ.They're not mutually exclusive some of the thermosphere is in the ionosphere
//The ionosphere is a part of the upper atmosphere, comprising portions of the mesosphere, thermosphere and exosphere, distinguished because it is ionized by solar radiation//
http://en.wikipedia.org/wiki/Ionosphere
//The ionosphere is a part of the upper atmosphere, comprising portions of the mesosphere, thermosphere and exosphere, distinguished because it is ionized by solar radiation//
http://en.wikipedia.org/wiki/Ionosphere