Zoom out until you can see the stair-step pattern of the rift valley to the west of nairobi. about how far is it from nairobi to the edge of the rift valley? how did this rift valley form?

Using mr smith and his id, identify two potential internal validity threats that might affect the a—b design. tell me how that threat might impact conclusions in the a—b design. note #1: you cannot use maturation (since i already did that one for note #2: there are some mr smith id threats that won’t have much impact in a single case design.