The nations of north africa differ greatly from the nations of sub-saharan africa. how might physical geography play a role in these differences? culturally, the countries of morocco, algeria, tunisia, libya, and egypt are more closely tied to the neighboring middle east. discuss why this is the case, citing specific examples.

Pj conducts an experimental study on the effects of soft music during high stakes science testing. he randomly assigns students at the school. in one condition he does not provide music for testing while in the other group he does provide the music. he administers a pretest at the beginning of the year and a posttest at the end of the year. pj’s design is best described as a: a.static group comparisonb. pretest-posttest control group designc.control-group-time-series designd. nonrandomized control-group pretest-posttest design