Asap no rocky !
eastern europe has remained less economically developed than western europe because

the market economy of western europe provides a food shortage
eastern europe industrialized sooner
the soviet union and its collapse hindered development
the eu prevents former soviet countries from joining

explain !

the Soviet Union and its collapse hindered development.

Explanation:

This is one of the main reasons why Eastern Europe has remained less economically developed than Western Europe. The communist regime of the Soviet Union allowed the country to industrialize massively during the first few years after communism was implanted. However, the growth decreased towards the end of the regime. As the Soviet Union collapsed, the political changes slowed down development even further.

i don't get what you mean

explanation:

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.