California law makes it mandatory that every vehicle (except a motorcycle) have 2 functional tail lamps that are visible

According to the aztec history, how did the aztecs know where to build their new city of tenochtitlan? why was this a good location?

What happened in georgia as a result of the supreme court ruling in brown v. board of education?

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.