What is the theory of continental drift? * The continents move slowly over Earth's surface.
The continents moved millions of years ago, but now are fixed.
The continents were fixed, but recently have begun to move.
The continents are fixed in position.

During the late 19th century, russia's settlement and development of siberia was made possible by the invention of the

1. describe the concept of the unitary executive. discuss whether this concept is practical.

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.