Yes they can
No, as the Gameboy advanced came after the Gameboy color. So F that
yes
On the 3ds shop, you are able to buy and download older games. That work for the buttons on the 3ds of course.
Yes, and the game will be in color.
Yes.
No.
On most games it doesnt, but on some games it will
No.
no. because the graphics on the ps2 games are more advanced than the ps1 so the game wont work optimally
No a PS2 game is not going to work on a PS1. The PS2 games are DVDs and the PS2 is more advanced
No, it does not work that way. GameBoy Advance games are newer than the GameBoy Color, so the GameBoy Color system cannot support the game. However, you can play GameBoy Color games on a GameBoy Advance system if you want.
Yes, they will, the GBA is backwards compatible and will play GBC games.