When upgrading from OS X lion to OS X mountain lion will it automatically uninstall OS X lion

when upgrading from OS X lion to OS X mountain lion will it automatically uninstall OS X lion?

Yes. You download Mountain Lion from the App Store and, once the download is complete, the installation of Mountain Lion will begin. You can quit it at this point and backup the "Install OS Mountain Lion.app" (which I suggest) the double-click it and begin the installation.
All remnants of Lion will be gone and you'll be running Mountain Lion.
Good luck,
Clinton

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