Why were most slaves taken from west africa and not central africa or southern africa?

What happens after a star goes supernova? just wondering! [tex]supernova [/tex] answer asap i really wanna know!

Account for differences in percentage population growth rates between more economically developed countries and less economically developed countries

Often, a goby fish and a shrimp will live together in a burrow the shrimp has dug in the sand. the shrimp is almost blind and therefore is unable to see predators approaching when he is outside of the burrow. when the shrimp is in danger, the goby fish touches the shrimp with its tail to warn him. then, both go back into their burrow for safety. which type of relationship does this represent? a. mutualism b. parasitism c. commensalism d. predator/prey