Why is Gamora?
Warum ist Gamora?
I knew that this would be here.
Ich bin Groot.
Are "ss" and "ß" interchangeable?
No. See here for information about it, and here for instructions to type it.
Not quite, see what az_p posted. But if you're in a situation where you can't make a ß, "ss" is the best alternative. Kind of like ae, oe, and ue for the umlauted vowels.
why not <<besser>>?
Because "die Frage" is feminine. The adjectives need to match the gender and case of the noun which they refer to.
See here: http://www.bbc.co.uk/schools/gcsebitesize/german/grammar/adjectivesendingsrev2.shtml
Is 'bessere' Mixed Inflection and 'Frage' is accusative?
Definitely it's mixed inflection because of the eine pronoun preceding the adjective. I think it's nominative though.
It's accusative (direct object of "habe").
Danke! Haben Sie ein Lingot!
Wer ist Gamora?