Anyone know this? i would like some help.

Which of the following is an open question? "where are you from? " "when did you graduate from college? " "why did you leave your last job? " "do you have transportation to work? "

What happens when two galaxies approach each other? a. they form a black hole. b. they merge because of the strong gravitational pull they exert on each other. c. they shred each other into smaller galaxies. d. they form a supernova. e. they repel each other away because of their strong gravitational pull.

Wich of the following is not a receptor pair according to the opponent process theory