Yes, all turtles kiss or touch noses when they greet each other. It's the way they say hello and get information about each other. Just like dogs sniffing each others butts.
Yes, all turtles have backbones which are located under the shell.
yes
yes
Yes, they have internal ear structures. They are sensitive to vibration and sound.
yes
Yes they can
Yes you can, they are both variations of the same type of turtle. Just the same you can breed them to the albino.
Yes. Red eared sliders can eat lettuce but not a whole cabbage, I know this because I fead my Red eared slider lettuc.
Yes. My red ear slider turtles love to chase, catch and eat goldfish.
yes, it does.
yes
yes of course