Yes
Yes all wii games will work on a gamecube
All gamecube games should work for the Nintendo wii.
No it wouldn't work, all wii games are region locked.
No, wii remote plus games will have special mark on the box that says they are remote plus compatible
Yes, I think the wii classic controller can work with most of the games. You can have a look at the wii controllers online: http://www.dinodirect.com/Wii-Accessories/Wii-Controllers-1011/
It will work, but you're gonna have to buy all your games from the US.
Yes but not all the time but you can give it a try.
The Wii U can play all Wii games since it is backwards compatible.
There are strength training,yoga,aerobics, and balance games all made to work with the Wii fit setup. There is a Sports Active game, Jillian Michaels Fitness Ultimatum 2009, and even a cheerleading game that are all also made to work with the Wii Fit.
Nintendo.com/wii
a game cube cannot play wii games a wii can play all game cube games provided they are not scratched
No, the Nintendo Wii U can be powered on without a gamepad and a Wii remote can be used to open applications and games on the Wii U. However, it is strongly recommended to have the Gamepad because all Wii U games are compatible with the gamepad, but not all Wii U games are compatible with the Wii remote and classic controllers