How did sub-Saharan Africa's expanding contacts in the Atlantic compare with its contacts with the Islamic world?

Which of these is a lower subgroup a. kingdom b. order c.genus d. species

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.