Can I install 2 different osxs (Maveriks and mountain lion) on my macbook with 2 different internal hard drives?

Macbook 15" i7 2.2 750GB and 16GB RAM
have plenty of space on my 2nd hard drive and want to try to install 2 OSx on both hard drives.
A- will that really work?
b- will Mac ask to choose which one to start?
I can't take a 'leap of faith' just yet as am away from my backup so wanna know if anyone has ever tried it?
i'll do it for fun so i have no valid reason.
Cheers

1. Yes.
2. By default, the second OS installed will be the startup disk. This can be changed from the Startup Disk pane of System Preferences and overridden by pressing Option at startup.
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