The heliocentric theory says that the:
a) the moon was the center of the universe
b) earth and all the other planets revolve around the sun
c) other planets revolve around the sun, but the earth stands still

What is an attack against a country called?

What did populists set their sights on after achieving some success on a local level in the late 1800s?

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.